diff --git a/.github/workflows/sbt.yml b/.github/workflows/sbt.yml
index fe01cba6..797c4b6a 100644
--- a/.github/workflows/sbt.yml
+++ b/.github/workflows/sbt.yml
@@ -6,17 +6,32 @@ on:
 
 jobs:
   test:
-
     runs-on: ubuntu-latest
 
     steps:
     - uses: actions/checkout@v4
-    - name: Set up JDK 21
+    - name: Set up JDK 25
       uses: actions/setup-java@v4
       with:
         distribution: 'zulu'
-        java-version: '21'
+        java-version: '25'
         cache: 'sbt'
     - uses: sbt/setup-sbt@v1
     - name: Test with SBT
       run: sbt test
+
+  deps:
+    if: github.ref == 'refs/heads/master'
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up JDK 25
+      uses: actions/setup-java@v4
+      with:
+        distribution: 'zulu'
+        java-version: '25'
+        cache: 'sbt'
+    - uses: sbt/setup-sbt@v1
+    - uses: scalacenter/sbt-dependency-submission@v2
diff --git a/README.md b/README.md
index 383b7e3d..b82cda09 100644
--- a/README.md
+++ b/README.md
@@ -2,15 +2,16 @@
 
 [![Scala CI](https://github.com/sim642/adventofcode/workflows/Scala%20CI/badge.svg?branch=master)](https://github.com/sim642/adventofcode/actions?query=workflow%3A%22Scala+CI%22)
 
-| Year | Solutions | Inputs | Tests |
-| ---- | --------- | ------ | ----- |
-| 2015 | [Solutions](src/main/scala/eu/sim642/adventofcode2015) | [My inputs](src/main/resources/eu/sim642/adventofcode2015) | [Tests](src/test/scala/eu/sim642/adventofcode2015) |
-| 2016 | [Solutions](src/main/scala/eu/sim642/adventofcode2016) | [My inputs](src/main/resources/eu/sim642/adventofcode2016) | [Tests](src/test/scala/eu/sim642/adventofcode2016) |
-| 2017 | [Solutions](src/main/scala/eu/sim642/adventofcode2017) | [My inputs](src/main/resources/eu/sim642/adventofcode2017) | [Tests](src/test/scala/eu/sim642/adventofcode2017) |
-| 2018 | [Solutions](src/main/scala/eu/sim642/adventofcode2018) | [My inputs](src/main/resources/eu/sim642/adventofcode2018), [other inputs](src/test/resources/eu/sim642/adventofcode2018) | [Tests](src/test/scala/eu/sim642/adventofcode2018) |
-| 2019 | [Solutions](src/main/scala/eu/sim642/adventofcode2019) | [My inputs](src/main/resources/eu/sim642/adventofcode2019) | [Tests](src/test/scala/eu/sim642/adventofcode2019) |
-| 2020 | [Solutions](src/main/scala/eu/sim642/adventofcode2020) | [My inputs](src/main/resources/eu/sim642/adventofcode2020), [other inputs](src/test/resources/eu/sim642/adventofcode2020) | [Tests](src/test/scala/eu/sim642/adventofcode2020) |
-| 2021 | [Solutions](src/main/scala/eu/sim642/adventofcode2021) | [My inputs](src/main/resources/eu/sim642/adventofcode2021), [other inputs](src/test/resources/eu/sim642/adventofcode2021) | [Tests](src/test/scala/eu/sim642/adventofcode2021) |
-| 2022 | [Solutions](src/main/scala/eu/sim642/adventofcode2022) | [My inputs](src/main/resources/eu/sim642/adventofcode2022) | [Tests](src/test/scala/eu/sim642/adventofcode2022) |
-| 2023 | [Solutions](src/main/scala/eu/sim642/adventofcode2023) | [My inputs](src/main/resources/eu/sim642/adventofcode2023) | [Tests](src/test/scala/eu/sim642/adventofcode2023) |
-| 2024 | [Solutions](src/main/scala/eu/sim642/adventofcode2024) | [My inputs](src/main/resources/eu/sim642/adventofcode2024) | [Tests](src/test/scala/eu/sim642/adventofcode2024) |
+| Year | Solutions | Tests |
+| ---- | --------- | ----- |
+| 2015 | [Solutions](src/main/scala/eu/sim642/adventofcode2015) | [Tests](src/test/scala/eu/sim642/adventofcode2015) |
+| 2016 | [Solutions](src/main/scala/eu/sim642/adventofcode2016) | [Tests](src/test/scala/eu/sim642/adventofcode2016) |
+| 2017 | [Solutions](src/main/scala/eu/sim642/adventofcode2017) | [Tests](src/test/scala/eu/sim642/adventofcode2017) |
+| 2018 | [Solutions](src/main/scala/eu/sim642/adventofcode2018) | [Tests](src/test/scala/eu/sim642/adventofcode2018) |
+| 2019 | [Solutions](src/main/scala/eu/sim642/adventofcode2019) | [Tests](src/test/scala/eu/sim642/adventofcode2019) |
+| 2020 | [Solutions](src/main/scala/eu/sim642/adventofcode2020) | [Tests](src/test/scala/eu/sim642/adventofcode2020) |
+| 2021 | [Solutions](src/main/scala/eu/sim642/adventofcode2021) | [Tests](src/test/scala/eu/sim642/adventofcode2021) |
+| 2022 | [Solutions](src/main/scala/eu/sim642/adventofcode2022) | [Tests](src/test/scala/eu/sim642/adventofcode2022) |
+| 2023 | [Solutions](src/main/scala/eu/sim642/adventofcode2023) | [Tests](src/test/scala/eu/sim642/adventofcode2023) |
+| 2024 | [Solutions](src/main/scala/eu/sim642/adventofcode2024) | [Tests](src/test/scala/eu/sim642/adventofcode2024) |
+| 2025 | [Solutions](src/main/scala/eu/sim642/adventofcode2025) | [Tests](src/test/scala/eu/sim642/adventofcode2025) |
diff --git a/build.sbt b/build.sbt
index 1ae737b5..f6c54161 100644
--- a/build.sbt
+++ b/build.sbt
@@ -2,7 +2,7 @@ name := "adventofcode"
 
 version := "0.1"
 
-scalaVersion := "3.5.2"
+scalaVersion := "3.7.4"
 scalacOptions ++= Seq(
   "-deprecation",
   "-feature",
@@ -16,11 +16,11 @@ scalacOptions ++= Seq(
 
 libraryDependencies += "org.scalactic" %% "scalactic" % "3.2.19"
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.19" % "test"
-libraryDependencies += "org.scalacheck" %% "scalacheck" % "1.18.1" % "test"
+libraryDependencies += "org.scalacheck" %% "scalacheck" % "1.18.1" % "test" // TODO: 1.19 available, but not corresponding scalatestplus
 libraryDependencies += "org.scalatestplus" %% "scalacheck-1-18" % "3.2.19.0" % "test"
 libraryDependencies += "org.scala-lang.modules" %% "scala-parser-combinators" % "2.4.0"
-libraryDependencies += "com.lihaoyi" %% "ujson" % "4.0.2"
-libraryDependencies += "tools.aqua" % "z3-turnkey" % "4.13.0.1"
+libraryDependencies += "com.lihaoyi" %% "ujson" % "4.4.1"
+libraryDependencies += "tools.aqua" % "z3-turnkey" % "4.14.1"
 libraryDependencies += "io.github.hughsimpson" %% "scalameter" % "0.22.1" % "test" // Scala 3 compatible scalameter fork
 
 // TODO: scalameter tests don't work in SBT
diff --git a/project/build.properties b/project/build.properties
index 1767a6f8..a360ccac 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -1 +1 @@
-sbt.version = 1.10.5
+sbt.version = 1.11.7
diff --git a/src/main/resources/eu/sim642/adventofcode2024/day21.txt b/src/main/resources/eu/sim642/adventofcode2024/day21.txt
new file mode 100644
index 00000000..45e27e1d
--- /dev/null
+++ b/src/main/resources/eu/sim642/adventofcode2024/day21.txt
@@ -0,0 +1,5 @@
+593A
+508A
+386A
+459A
+246A
diff --git a/src/main/resources/eu/sim642/adventofcode2024/day22.txt b/src/main/resources/eu/sim642/adventofcode2024/day22.txt
new file mode 100644
index 00000000..d71e66ec
--- /dev/null
+++ b/src/main/resources/eu/sim642/adventofcode2024/day22.txt
@@ -0,0 +1,2462 @@
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diff --git a/src/main/resources/eu/sim642/adventofcode2024/day23.txt b/src/main/resources/eu/sim642/adventofcode2024/day23.txt
new file mode 100644
index 00000000..6292714d
--- /dev/null
+++ b/src/main/resources/eu/sim642/adventofcode2024/day23.txt
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diff --git a/src/main/resources/eu/sim642/adventofcode2024/day24.txt b/src/main/resources/eu/sim642/adventofcode2024/day24.txt
new file mode 100644
index 00000000..3c2b9548
--- /dev/null
+++ b/src/main/resources/eu/sim642/adventofcode2024/day24.txt
@@ -0,0 +1,313 @@
+x00: 1
+x01: 1
+x02: 0
+x03: 0
+x04: 0
+x05: 1
+x06: 0
+x07: 1
+x08: 1
+x09: 0
+x10: 1
+x11: 0
+x12: 0
+x13: 0
+x14: 1
+x15: 1
+x16: 1
+x17: 0
+x18: 0
+x19: 0
+x20: 1
+x21: 0
+x22: 1
+x23: 0
+x24: 0
+x25: 0
+x26: 0
+x27: 1
+x28: 0
+x29: 1
+x30: 0
+x31: 0
+x32: 1
+x33: 1
+x34: 1
+x35: 0
+x36: 0
+x37: 0
+x38: 1
+x39: 1
+x40: 1
+x41: 1
+x42: 0
+x43: 0
+x44: 1
+y00: 1
+y01: 0
+y02: 1
+y03: 1
+y04: 0
+y05: 0
+y06: 1
+y07: 1
+y08: 0
+y09: 1
+y10: 1
+y11: 1
+y12: 1
+y13: 0
+y14: 1
+y15: 0
+y16: 0
+y17: 1
+y18: 0
+y19: 1
+y20: 0
+y21: 1
+y22: 1
+y23: 1
+y24: 0
+y25: 1
+y26: 1
+y27: 0
+y28: 1
+y29: 1
+y30: 0
+y31: 1
+y32: 0
+y33: 0
+y34: 0
+y35: 1
+y36: 1
+y37: 1
+y38: 1
+y39: 1
+y40: 0
+y41: 1
+y42: 0
+y43: 1
+y44: 1
+
+x23 AND y23 -> mhq
+dbf XOR dsb -> z35
+x41 AND y41 -> qss
+kbv AND ctw -> qhg
+djs OR tgk -> ccp
+nmw AND bgp -> bcr
+jns OR npn -> jbv
+y29 AND x29 -> tjt
+y17 AND x17 -> nhh
+kmm AND ptk -> vnr
+hbr AND qfp -> mjr
+qfk AND pvj -> ndp
+tvb XOR jhd -> z25
+y29 XOR x29 -> wft
+rqd AND cns -> grb
+jbv AND kjg -> vjg
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+x16 XOR y16 -> mft
+x37 XOR y37 -> hbr
+x24 XOR y24 -> cns
+y40 XOR x40 -> pgc
+ccd OR cst -> cbk
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+y06 AND x06 -> cnm
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+bsm OR vsc -> fjn
+x15 XOR y15 -> srk
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+kbv XOR ctw -> z31
+x10 XOR y10 -> htc
+x08 XOR y08 -> knh
+fgc AND dvm -> nfn
+y03 AND x03 -> ssj
+x26 XOR y26 -> spf
+y02 AND x02 -> psw
+x36 XOR y36 -> fcf
+ptj OR dtg -> spg
+stm OR tjt -> gsj
+mmw XOR ncf -> z23
+y26 AND x26 -> csh
+rrj AND mft -> tnt
+x05 XOR y05 -> chs
+x16 AND y16 -> khn
+nqm AND fmf -> tgq
+wft XOR nnq -> z29
+y13 AND x13 -> ggg
+rcb OR khg -> mfp
+y28 AND x28 -> wgd
+csf AND bck -> qsg
+x31 XOR y31 -> kbv
+rrj XOR mft -> z16
+hhg AND ccp -> msp
+y00 XOR x00 -> z00
+x25 XOR y25 -> khg
+x42 AND y42 -> djs
+ggg OR hvg -> csf
+pps XOR wdg -> vdc
+y04 XOR x04 -> pvj
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diff --git a/src/main/resources/eu/sim642/adventofcode2024/day25.txt b/src/main/resources/eu/sim642/adventofcode2024/day25.txt
new file mode 100644
index 00000000..d813e77d
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diff --git a/src/main/resources/eu/sim642/adventofcode2025/day10.txt b/src/main/resources/eu/sim642/adventofcode2025/day10.txt
new file mode 100644
index 00000000..56a0bbe0
--- /dev/null
+++ b/src/main/resources/eu/sim642/adventofcode2025/day10.txt
@@ -0,0 +1,162 @@
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+[#...] (0) (0,2) (2,3) (0,1) {39,4,34,18}
+[#.#.#.#.] (3,4,5,6,7) (0,2,3,5,6,7) (0,1,3,4,5,6,7) (0,2,3,4,5) (0,1) (0,2,3,5,7) (0,1,2,3,5,6,7) (1,7) (1,4,6) {60,44,47,67,36,67,59,62}
+[###....] (1,2,3,6) (4,6) (0,4,6) (4,5) (1,2,3) (0,4,5,6) (0,1,2,4,5) {10,28,28,23,32,22,29}
+[#####.###] (0,2,5,7) (1,2,5,6,7,8) (1,2,3,4,5,7,8) (0,1,3,4,5,7,8) (0,1,3,4,6,7,8) (1,3,5,7) (0,1,2,4) (2) (0,1,4,8) (0,1,2,3,4,6,7,8) (0,2,5,8) {49,63,52,35,41,46,31,61,49}
+[.#.#] (1,3) (0,3) (0,1,2) (1,2) {117,130,112,23}
+[...##...] (3,4,5,6,7) (0,5) (1,2,3,5,7) (0,1,2,3,7) (1,3,6) (0,3,5) (0,1,2,3,5,6) {38,218,23,231,2,55,203,19}
+[....#...] (0,2,3,4,5,7) (0,1,2,3,4,7) (0,3,7) (2,5) (0,2,3,5,6) (1,3,4,5,6,7) (3,4,5,6) (2,4,7) (4,5) {22,19,18,53,42,50,36,41}
+[.#####..] (1,2,3,6,7) (0,3,5,6) (0,1,2,4,5,7) (1,2,3,4,5,7) (5,6) (4,7) {30,33,33,27,44,46,27,51}
+[.....##.#] (0,2,3,6,7,8) (1,3,5,6,7) (0,1,2,5,6,7) (0,1,2,3,4,5,6,7) (1,2,3,5,6,8) (0,3,4,5,6) (0,7) (0,1,2,4,5,7,8) (0,2,3,6,8) (5,6,8) {76,34,57,49,41,53,56,53,49}
+[#.###] (0,2,4) (1,2,4) (1,2,3,4) (0,3) {200,16,24,195,24}
+[##...#.] (0,2,3,4,6) (0,4,5,6) (0,1,4,5,6) (2,3) (1,2,3,4,5,6) {10,17,35,35,27,26,27}
+[#.##.#] (1,3) (0,1,4,5) (0,2,3,5) (1,5) (0,2,5) (5) (1,2,3) (1,2,4,5) {38,59,53,51,25,67}
+[###.##] (1,4) (0,2,3,4,5) (1,3) (0,3) (0,2) {211,12,195,202,194,184}
+[##...####] (1,7) (2,5,7,8) (5,6,7) (0,2,3,4,5,6,8) (0,1,2,3,4,5,7) (0,1,3,7) (0,1,4,5,6,8) (0,2,6) (0,1,2,5,8) {43,39,44,20,27,49,20,34,28}
+[...#.#.#.#] (1,4,5,8,9) (0,1,3,5,7) (0,1,2,3,4,5,6) (0,1,2,4,5,7,8,9) (4,6,7) (0,2) (1,3,4,5,6,8) (0,1,2,3,4,5) (1,2,4,6,8,9) (6,9) (0,2,3,5,6,7,8,9) (1,7) {62,83,81,43,70,61,53,51,56,53}
+[##....#..] (0,1,2,3,4,5,6,8) (0,1,6) (0,2,3,5,6,7) (1,2) (1,2,3,6,7) (0,1,2,3,5,7) (2,3,4,5) {37,56,85,68,21,51,39,47,1}
+[..#..#] (0,3,4,5) (2,5) (1,2,5) (1,2,3) {19,18,37,29,19,46}
+[#..######.] (0,3,8) (0,1,2) (2,3,5,6,8,9) (1,7,9) (0,5,8) (0,4,9) (0,1,4,6,8) (6,7,8) (1,2,5,9) (3,4,5,8,9) (0,3,6,7,8,9) (3) {40,42,36,48,28,57,41,21,74,50}
+[.#....] (0,2,3,5) (2,4) (1,2,3,4) (4) (0,2,3,4,5) (1,3,4,5) (2,3,4,5) {11,24,47,55,62,43}
+[.##..##] (0,3,6) (2,4,5,6) (0,1,2,3,4,6) (1,4,5) (0,2,3,6) (3,4) {176,6,172,191,26,11,181}
+[#.#..####] (0,1,2,3,4,5,6,8) (0,1,2,3,5,6,8) (0,4,5,6,7) (0,2,3,4,6) (0,3,5,6) (6,7) (0,2,5,6,7,8) (2,3,4,5,6,8) {76,23,51,67,54,66,94,27,34}
+[.##.##.] (1,2,3,6) (1,3,4,5,6) (1,2,4,5) (3) (0,5) (0,2) (0,3,4) (0,2,5) (4) {148,43,62,51,27,153,36}
+[#.##] (0,1,3) (1,2) (0,3) {175,36,20,175}
+[.###.#] (1,2,4,5) (4,5) (1,3) (0,1,4) (0,1,4,5) (0,4) {10,43,13,20,25,24}
+[..###.#] (1,2,4,5,6) (2,5) (1,2) (0,1,4) (3,4,5,6) (0,3,4,5) (0,2,4) (3) (6) {132,36,164,38,167,61,50}
+[#.#....#] (3,5) (0,1,2,3,4,5) (0,1,3,4,5,6) (0,2,3,4,7) (1,2,3,5,7) (2,6) (0,1,3,4,6,7) (6,7) (1,6,7) (2,3,4,7) {37,66,49,72,47,43,45,64}
+[.#...] (0,1,2,3) (1,2) (0,2,3,4) (0,1,3) {133,15,146,133,132}
+[..#..#....] (0,1,2,5,8,9) (1,4,5,6,7) (0,2,3,4,5,6,8,9) (0,1,3,5,6,8) (2,3,5) (0,1,3,4,5,7,8,9) (0,1,2,3,4,8) (0,1,2,4,7,9) (0,1,3,4,5,6,8,9) (0,1,5,7,8) (0,3,4,9) (1,6) (4,5,6,7) {86,99,36,84,72,95,65,44,71,58}
+[.##...#.#] (1,2,3,4,5,6,7) (5,8) (0,4,5,8) (0,4) (2,5,6,7) (2,7) (2,8) (0,1,4,6,8) (0,1,3,7) (2,5,6,7,8) {68,38,28,22,50,48,31,39,60}
+[#.#####] (2,3,4,6) (2,5) (1,3,4,5,6) (1,2,5,6) (0,5,6) (0,1,2,3,4,6) (1,2,3,5,6) (1,3,4,6) (0,2,3,4,5,6) {23,42,62,53,35,62,74}
+[..##..] (0,2,5) (2,3) (1,2) (0,4) (2,4,5) (0,3) {42,5,188,178,19,21}
+[#.#...##.] (0,1,2,3,5,6,7,8) (1,2,5,7,8) (0,1,2,4,5,6,7) (1,2,4,6) (1,2,7) (2,7,8) (0,1,5,7) (2,6,8) (4,6) (0,1,3,7,8) (0,2,6,8) {61,81,97,16,45,42,77,83,63}
+[##.##...#.] (0,2,3,4,7,8,9) (5,8) (1,2,5,7) (1,3,8) (0,1,2,3,4,5,7,8,9) (0,3,4,5,6,7,8,9) (4,5,6,8,9) (3,5,6,7) (1,9) (0,4) (1,3,4,6,7,9) (3,5,6,8,9) (1,2,3,5,8,9) {7,58,28,50,18,50,29,49,34,34}
+[####..#.] (0,1,3,4,5) (1,2,3,4,7) (1,2,3,5) (1,2,3,4,5) (0,2,3,4,5,6,7) (1,4,5,7) {17,45,35,46,50,42,6,20}
+[.#.#.#.] (2,3,4,5) (0,4) (1,2,4,6) (0,1,2,3,6) (1,2,3,4,6) (0,4,6) {12,37,53,36,59,16,38}
+[##...#####] (0,1,5,6) (1,4,5,6,7,8,9) (0,1,2,3,4,5,6,7) (0,3,6,8,9) (0,4,5,6,7,8,9) (1,3,4,6,7,8,9) (2,3,4,8,9) (3) (0,1,2,4,5,7,8,9) (0,1,2,3,4,5,6,9) (0,2,5,6,7,9) (2,3,4,5,7) {66,88,60,76,107,91,85,93,89,90}
+[##..] (0,3) (0) (1) (2) (1,2) {7,5,16,3}
+[#.##] (0,1) (0,3) (2) {28,15,3,13}
+[##..] (1,2,3) (2,3) (3) (0,2) (0,1) (1) {15,185,20,23}
+[##.#] (0,1,3) (0,2,3) {151,140,11,151}
+[#.#.] (1,2,3) (0,2) {4,20,24,20}
+[#.##..#] (1,2,4,5) (2,5,6) (3,6) (0,1,3,4) (0,1,2,5,6) (0,1,5,6) {26,34,199,19,14,204,209}
+[#..#] (1,2) (0,3) (1) {11,16,1,11}
+[...#...#..] (3,7) (0,1,4,8) (0,2,3,4,6,8) (0,1,2,3,4,6,7,9) (0,4,5,6) (0,1,2,3,6,7,8,9) (1,2,3,6,7,9) (1,5,6,8,9) {54,43,48,56,42,7,55,43,33,36}
+[..#..###..] (0,1,2,3,6,9) (1,2,3,4,6,7,8) (0,2,4,8) (0,2,4,5,6,8,9) (0,3,4,6) (0,2,3,4,5,6,8,9) (0,1,5,7,8) (2,3,7,8,9) {71,32,75,68,71,42,74,32,73,53}
+[#.###] (0,2,3,4) (0,2,4) (0,1,2,3) (1,3) {51,24,51,41,32}
+[#.#..#.##] (2,3,6) (3,4,5,6,7,8) (0,1,2,3,4,6,8) (0,1,2,3,4,5,6,8) (1,3) (1,4,5,6,8) (6,8) (0,1,3,4,6,7) (1,2,3,4,8) (4,6) {44,211,64,232,70,14,80,19,53}
+[.###.] (3) (1,4) (2,3) (0,2,3,4) (1,2,4) (0,2) (2,4) {19,122,57,47,151}
+[##.#.] (0,2,3) (0,2,3,4) (1,2,4) (0,1,4) (0) (3,4) {36,19,26,33,36}
+[#..#.#..] (0,1,5,6) (3,6) (0,1) (0,1,3,4,5,6) (6,7) (5,6,7) (2,5,6) (2,3,4) (0,3,5,6) {48,47,29,225,34,64,274,34}
+[#.....] (0,2,3,5) (0) (0,1,2,3) (3,4) (0,1,4) (0,1,2,3,5) (1,2,3,4) (3,5) {29,20,24,41,20,23}
+[####] (3) (2) (1,2,3) (0,2) (0) (1,2) {21,31,39,14}
+[.#####..#] (1,4) (2,7,8) (2,4,5,6,8) (0,1,2,3,4,5,8) (0,5,6) (1,6) (2,4,5,7,8) (0,2,3,4,5) (3) {33,36,49,19,49,57,47,11,48}
+[.#...#.] (2,4,6) (3,4,6) (0,1) (1,4) (0,2) (0,1,3,4,6) (0,5,6) {8,14,9,24,40,1,32}
+[###.##.###] (2,8) (0,1,2,3,5,6,7,8,9) (0,2,4,5,7,8) (4,8,9) (0,1,4,5,6,7,8,9) (0,2,9) (0,1,2,3,4,5,8,9) (0,1,3,5,6,7,8,9) (0,1,3,5,8,9) (0,2,3,7) (0,1,2,3,5,6,7,8) {115,77,80,81,36,90,53,80,104,77}
+[#.###] (1,3) (0,3,4) (0,1,2,3) (0,2,4) (0,2,3,4) (1) (0,3) {50,22,31,56,44}
+[.#.#] (1,2) (0,2,3) (2,3) {13,8,194,186}
+[.#.#......] (8) (0,4,8,9) (0,2,4,8,9) (1,2,4) (0,1,2,6,8) (5,8) (2,3,5,6,7,8,9) (0,2,3,4,5,6,7,8,9) (2,3,5,7,9) (2,4,6,8,9) (0,1) (4,6,7) {81,45,76,21,77,35,44,26,99,60}
+[.#..##] (3,5) (1,2,3,4) (0,1,2) (0,1,3,4,5) (1,2) (1,2,3,4,5) (0,2,3) {35,59,60,62,44,24}
+[###..#] (1,2,5) (3,5) (0,3,4) (0,1,2,5) {174,165,165,32,15,182}
+[.#.#] (1,2) (1,3) (0,1) (0,1,3) (0,3) {38,69,19,39}
+[..#..#] (1,2,3,4,5) (4) (0,2,4) (2,5) (0,2,3,4) (0,1,3,4) {27,2,29,17,38,4}
+[###.#.##.#] (1,6,8,9) (1,4,5,9) (1,2,3,5,6,8,9) (0,1,2,4,5,6) (0,1,3,4,5,6,7,8) (0,4) (0,2,3,4,5,7,8,9) (0,2,3,5,6,9) (0,2,3) (2,3,4,9) {61,69,176,183,198,81,62,23,46,185}
+[...##.#..#] (2,4,5,8,9) (0,2,3,4,5,6,7,8,9) (2,4,8) (7,8) (3,5,8) (0,4,6,8,9) (4,5,6,7,9) (1,2,3,4,5) (0,1,2,5,6,7,8,9) {32,10,38,29,53,38,35,19,71,35}
+[...##..] (0,2,4,5,6) (2,3,4,5,6) (1,2,3,4,6) (1,3,4,5,6) (0,1,2,3,6) {111,26,127,35,142,135,144}
+[...###.###] (0,1,2,3,6,7,8,9) (0,1,4,5,6,8) (1,2,3) (0,2,6,7) (1,4) (3,6) (1,2,3,6,7) (2,4) (4,5,6,8) (1,2,3,6,7,8,9) (0,2,3,4,6,7,9) {8,65,45,203,30,7,197,31,17,12}
+[...#.##] (3,6) (0,1,3,4) (0,2,3,4,5,6) (0,1,4,5) (3,5,6) (0,1,2) (0,1,2,4) {68,56,34,48,49,36,30}
+[.#.#..#] (1,4) (2,3,4) (5,6) (1,2,3,5) (0,1,2,3,4,6) (3,4,5) (3,5) (0,2,5,6) {13,25,49,39,23,41,23}
+[.#..] (0,1,2) (2,3) (0,2) (0,2,3) {46,7,57,30}
+[#####.#.] (0,3,4,5,7) (0,1,6) (0,1,3,5,6,7) (2,3,5) (2,3,4) (1,4,5,6,7) {36,28,24,40,33,30,28,21}
+[...#.##.#] (0,2,7,8) (1,4,6) (0,1,2,3,4,5,6) (7,8) (1,2,4) (0,6,7,8) (0,1,2,3,5,6,7) (3,7,8) (1,2,3,4,5,6,7) {44,70,68,55,64,38,64,75,51}
+[..#.#] (4) (0,3,4) (0,2,3,4) (0,1,2) (3) (1,2,3) (2,3,4) {24,17,48,51,53}
+[####....#.] (6,7) (0,2,3,4,5,6) (0,1,4,5,6,7,8) (1,9) (1,4,7,8) (1,6,8) (1,6) (2,3,4,7) (3,5,8) (0,8,9) (1,2,3,4,6,7,8,9) (4,7,8) (2,5,9) {35,53,31,28,29,41,61,24,48,42}
+[.##.#.###] (0,2,3,4) (3,4,6) (0,3,8) (0,1,5,6,7,8) (2,3) (0,1,2,4) (0,1,3,5,6,8) (0,2,4,5,6,8) (0,4,5,8) (1,3,4,5,8) {39,3,17,32,48,27,33,0,38}
diff --git a/src/main/resources/eu/sim642/adventofcode2025/day11.txt b/src/main/resources/eu/sim642/adventofcode2025/day11.txt
new file mode 100644
index 00000000..29b9e1d2
--- /dev/null
+++ b/src/main/resources/eu/sim642/adventofcode2025/day11.txt
@@ -0,0 +1,631 @@
+yoy: dtu sgc qjc viq
+vyp: tcu wrp
+xof: jlp puv cth jwv
+bvz: pis
+mec: nem rak
+bxi: ykt rie
+ztr: xhp gms
+mbs: isu bez pna
+yzt: fqw ubj rhi
+ctd: fri lpm run
+bkj: hqz kag chj mop ysj
+cml: wsd qdv wjf moy
+jjv: pgt rua you
+hwk: uvn
+xvk: tre
+jjf: kag hqz chj mop ysj
+goe: kas
+xuc: zdt
+fqw: qrh lyw umm bjp
+run: hjt heb jyg
+yuu: vqz jih
+jya: uuv kgc ero onh
+bid: rcu aap zag
+sll: evf uuv ero
+fri: hjt
+jzu: wyu wrp tcu
+lsv: amz bzc els
+nkk: upz nos
+zvf: phf cpk sez edr
+lcc: isj pgs
+kmm: ave zou plb
+cpk: eud pix wqm
+vow: mcl vfd
+ofc: typ
+gtb: nmi yfy syh
+ejd: azc qqp uxi zej
+jxr: zwh oec nwz vch
+tgx: wrp tcu
+pmo: els bzc amz
+hyd: wvv xeq
+xcr: rvg dpn
+wrp: weh yzt foo dcq uob
+lbj: wyu ygr tcu
+egw: cga
+xnf: xeq bar kmm wvv dea
+moy: pxf fvd
+nsu: lcc kpp ftz
+dcq: rcs vtd fal
+uyh: out
+opo: isi
+cyu: cav zzc cao anq eze wlg jcn xpr gof syk dko cml cfq fmg xdi ytv egw vwg bsm cdi fki bmv fuf nlr clr
+tom: yec uxi zej
+vxo: ykk auv lry kmd
+fjd: vxo obq
+xhb: xro qzn
+djq: ysj kag hqz chj
+pve: out
+zvx: byt fjg
+heb: djq
+ejy: pis urk cfx opo rdh
+rib: mtt fjo tas pqh
+tgh: mdu cbx hfh
+cjv: iow vre
+fmg: bey
+mlf: kis
+sgc: rib
+awe: afr
+edr: jzd wqm nrn
+bqo: cpc ico twl
+rld: jir
+ave: cpc ico
+tzw: hmh
+sqt: cxy wrp wyu
+wub: oec
+qtm: ihy uwg oyu
+hsp: cxy
+obr: dst nre fft
+inc: tve
+amz: out
+uwr: edu oun pjg
+htk: ysj chj
+zwe: tgx ccu jzx vyp
+agc: npi hwk gnl
+uvz: xdr mbs
+yfy: ylw zyq lcx
+zou: ico
+nos: upw oim
+syk: zvf att ckc
+xow: uyh yel
+uce: cxy ygr wrp
+cbx: esf afr pgx
+vam: vsa wnl
+gmj: xex fdp ghk
+lgs: tcu cxy wyu
+gxv: ggt axc
+hnh: esf afr
+lgj: you
+nma: oqs yel uyh
+jcn: bey yht qtm
+kwd: els bzc
+fjo: kqy qdy mwi
+cga: zpi eyb hnh
+quf: bar dea
+coh: wcq feg rak
+fbh: rmn fvk xyx dxv
+pgs: zag rcu
+flr: wil
+dpn: ysj
+nri: lnk
+vsl: pgt you
+mqp: lnk gsk vvf
+rie: yhv
+yzn: ccu jzx tgx
+jsm: nwz vch
+and: cjv wil
+ihz: vrb xuc ael nkk
+zej: feg rak nem uso
+hfh: afr
+ckx: pdl
+kjz: out
+qdp: xdr zka mbs
+ihy: ogt tgh
+usc: jwf npx vee yhe
+zpc: afr esf
+gtm: qrh lyw wzo umm bjp
+cwp: qii paz lkx
+qsp: vyw dve nvi tud
+itw: cxy tcu
+dkm: out
+vbr: evf uuv kgc
+qzn: out
+kna: tgx jzx
+rgi: jlp vrw cth
+nrn: zpc
+xpr: ovd kar
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diff --git a/src/main/resources/eu/sim642/adventofcode2025/day12.txt b/src/main/resources/eu/sim642/adventofcode2025/day12.txt
new file mode 100644
index 00000000..6f6e73af
--- /dev/null
+++ b/src/main/resources/eu/sim642/adventofcode2025/day12.txt
@@ -0,0 +1,1030 @@
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diff --git a/src/main/resources/eu/sim642/adventofcode2025/day2.txt b/src/main/resources/eu/sim642/adventofcode2025/day2.txt
new file mode 100644
index 00000000..0b040d76
--- /dev/null
+++ b/src/main/resources/eu/sim642/adventofcode2025/day2.txt
@@ -0,0 +1 @@
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diff --git a/src/main/resources/eu/sim642/adventofcode2025/day3.txt b/src/main/resources/eu/sim642/adventofcode2025/day3.txt
new file mode 100644
index 00000000..da1e67f8
--- /dev/null
+++ b/src/main/resources/eu/sim642/adventofcode2025/day3.txt
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diff --git a/src/main/resources/eu/sim642/adventofcode2025/day4.txt b/src/main/resources/eu/sim642/adventofcode2025/day4.txt
new file mode 100644
index 00000000..9225f7e6
--- /dev/null
+++ b/src/main/resources/eu/sim642/adventofcode2025/day4.txt
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diff --git a/src/main/resources/eu/sim642/adventofcode2025/day5.txt b/src/main/resources/eu/sim642/adventofcode2025/day5.txt
new file mode 100644
index 00000000..5fc98137
--- /dev/null
+++ b/src/main/resources/eu/sim642/adventofcode2025/day5.txt
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diff --git a/src/main/resources/eu/sim642/adventofcode2025/day6.txt b/src/main/resources/eu/sim642/adventofcode2025/day6.txt
new file mode 100644
index 00000000..0d46e4b4
--- /dev/null
+++ b/src/main/resources/eu/sim642/adventofcode2025/day6.txt
@@ -0,0 +1,5 @@
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diff --git a/src/main/resources/eu/sim642/adventofcode2025/day7.txt b/src/main/resources/eu/sim642/adventofcode2025/day7.txt
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index 00000000..f2f6a6b6
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diff --git a/src/main/resources/eu/sim642/adventofcode2025/day8.txt b/src/main/resources/eu/sim642/adventofcode2025/day8.txt
new file mode 100644
index 00000000..2dfc8bfe
--- /dev/null
+++ b/src/main/resources/eu/sim642/adventofcode2025/day8.txt
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diff --git a/src/main/resources/eu/sim642/adventofcode2025/day9.txt b/src/main/resources/eu/sim642/adventofcode2025/day9.txt
new file mode 100644
index 00000000..ab41d76a
--- /dev/null
+++ b/src/main/resources/eu/sim642/adventofcode2025/day9.txt
@@ -0,0 +1,496 @@
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diff --git a/src/main/scala/eu/sim642/adventofcode2017/Day2.scala b/src/main/scala/eu/sim642/adventofcode2017/Day2.scala
index b3e6cdf5..429050b7 100644
--- a/src/main/scala/eu/sim642/adventofcode2017/Day2.scala
+++ b/src/main/scala/eu/sim642/adventofcode2017/Day2.scala
@@ -19,7 +19,7 @@ object Day2 {
 
   object Part2 extends Part {
     override def rowChecksum(row: Seq[Int]): Int = {
-      val descRow = row.sorted(Ordering[Int].reverse)
+      val descRow = row.sorted(using Ordering[Int].reverse)
       val dividePairs = for {
         i <- descRow.indices
         j <- (i + 1) until descRow.size
diff --git a/src/main/scala/eu/sim642/adventofcode2018/Day23.scala b/src/main/scala/eu/sim642/adventofcode2018/Day23.scala
index 63c04e44..84f2f233 100644
--- a/src/main/scala/eu/sim642/adventofcode2018/Day23.scala
+++ b/src/main/scala/eu/sim642/adventofcode2018/Day23.scala
@@ -4,6 +4,7 @@ import eu.sim642.adventofcodelib.box.{Box3, Box4}
 import eu.sim642.adventofcodelib.pos.Pos3
 import eu.sim642.adventofcodelib.pos.Pos4
 import eu.sim642.adventofcodelib.IntegralImplicits.*
+import eu.sim642.adventofcodelib.graph.BronKerbosch
 
 import scala.collection.mutable
 import scala.util.boundary
@@ -40,35 +41,9 @@ object Day23 {
   }
 
   object NaiveCliquePart2Solution extends Part2Solution {
-    def maximumClique(neighbors: Map[Nanobot, Set[Nanobot]]): Set[Nanobot] = {
-      var best: Set[Nanobot] = Set.empty
-
-      def bronKerbosh(r: Set[Nanobot], p: Set[Nanobot], x: Set[Nanobot]): Unit = {
-        if (p.isEmpty && x.isEmpty) {
-          //println(r)
-          if (r.size > best.size)
-            best = r
-        }
-        else {
-          //val u = p.headOption.getOrElse(x.head)
-          val u = (p ++ x).maxBy(neighbors(_).size) // pivot on highest degree
-          var p2 = p
-          var x2 = x
-          for (v <- p -- neighbors(u)) {
-            bronKerbosh(r + v, p2 intersect neighbors(v), x2 intersect neighbors(v))
-            p2 -= v
-            x2 += v
-          }
-        }
-      }
-
-      bronKerbosh(Set.empty, neighbors.keySet, Set.empty)
-      best
-    }
-
     def maximumOverlap(nanobots: Seq[Nanobot]): Set[Nanobot] = {
       val neighbors: Map[Nanobot, Set[Nanobot]] = nanobots.map(nanobot1 => nanobot1 -> nanobots.filter(nanobot2 => nanobot2 != nanobot1 && nanobot1.overlaps(nanobot2)).toSet).toMap
-      maximumClique(neighbors)
+      BronKerbosch.maximumClique(neighbors)
     }
 
     def closestMostNanobots(nanobots: Seq[Nanobot]): Int = {
@@ -168,7 +143,7 @@ object Day23 {
 
     def closestMostNanobots(nanobots: Seq[Nanobot]): Int = {
       val queue: mutable.PriorityQueue[(Nanobot, (Int, Int), Int)] =
-        mutable.PriorityQueue.empty(Ordering.by({ case (octahedron, (lower, upper), originDist) =>
+        mutable.PriorityQueue.empty(using Ordering.by({ case (octahedron, (lower, upper), originDist) =>
           (upper, lower, -originDist)
           //(upper, -octahedron.radius, -originDist) // much faster but possibly incorrect?
         }))
@@ -266,7 +241,7 @@ object Day23 {
 
     def closestMostNanobots(nanobots: Seq[Nanobot]): Int = {
       val queue: mutable.PriorityQueue[(Box3, (Int, Int), Int)] =
-        mutable.PriorityQueue.empty(Ordering.by({ case (octahedron, (lower, upper), originDist) =>
+        mutable.PriorityQueue.empty(using Ordering.by({ case (octahedron, (lower, upper), originDist) =>
           (upper, lower, -originDist)
           //(upper, -octahedron.radius, -originDist) // much faster but possibly incorrect?
         }))
diff --git a/src/main/scala/eu/sim642/adventofcode2019/Day10.scala b/src/main/scala/eu/sim642/adventofcode2019/Day10.scala
index 1bebf7d2..83c57419 100644
--- a/src/main/scala/eu/sim642/adventofcode2019/Day10.scala
+++ b/src/main/scala/eu/sim642/adventofcode2019/Day10.scala
@@ -65,7 +65,7 @@ object Day10 {
       Seq.empty
     else {
       val visible = filterVisible(monitoring, asteroids)
-      val vaporizeRotation = visible.toSeq.sortBy(laserAngle(monitoring, _))(Ordering.Double.TotalOrdering)
+      val vaporizeRotation = visible.toSeq.sortBy(laserAngle(monitoring, _))(using Ordering.Double.TotalOrdering)
       vaporizeRotation ++ vaporizeSeq(monitoring, asteroids -- visible)
     }
   }
diff --git a/src/main/scala/eu/sim642/adventofcode2019/Day13.scala b/src/main/scala/eu/sim642/adventofcode2019/Day13.scala
index 42c81349..54245111 100644
--- a/src/main/scala/eu/sim642/adventofcode2019/Day13.scala
+++ b/src/main/scala/eu/sim642/adventofcode2019/Day13.scala
@@ -16,6 +16,8 @@ object Day13 {
       case (acc, LazyList(x, y, tile)) =>
         val pos = Pos(x.toInt, y.toInt)
         acc + (pos -> tile.toInt)
+      case (_, _) =>
+        throw new IllegalArgumentException("incomplete output")
     })
   }
 
diff --git a/src/main/scala/eu/sim642/adventofcode2019/Day18.scala b/src/main/scala/eu/sim642/adventofcode2019/Day18.scala
index 67855209..b083cccc 100644
--- a/src/main/scala/eu/sim642/adventofcode2019/Day18.scala
+++ b/src/main/scala/eu/sim642/adventofcode2019/Day18.scala
@@ -23,6 +23,7 @@ object Day18 {
   trait KeyNeighborsSolution extends Solution {
     case class PathData(distance: Int, pathDoors: Set[Pos], pathKeys: Set[Pos])
 
+    // https://en.wikipedia.org/wiki/Transit_node_routing
     def getKeyNeighbors(input: Input): collection.Map[Pos, collection.Map[Pos, PathData]]
 
     override def collectKeysSteps(input: Input): Int = {
diff --git a/src/main/scala/eu/sim642/adventofcode2021/Day23.scala b/src/main/scala/eu/sim642/adventofcode2021/Day23.scala
index 78440534..569869ad 100644
--- a/src/main/scala/eu/sim642/adventofcode2021/Day23.scala
+++ b/src/main/scala/eu/sim642/adventofcode2021/Day23.scala
@@ -33,6 +33,7 @@ object Day23 {
 
     private case class PathData(length: Int, pathPoss: Set[Pos])
 
+    // https://en.wikipedia.org/wiki/Transit_node_routing
     private val posNeighbors: collection.Map[Pos, collection.Map[Pos, PathData]] = {
       val allPoss: Set[Pos] = hallways ++ room2amphipod.keySet
 
diff --git a/src/main/scala/eu/sim642/adventofcode2022/Day16.scala b/src/main/scala/eu/sim642/adventofcode2022/Day16.scala
index 5621fecc..0f08baea 100644
--- a/src/main/scala/eu/sim642/adventofcode2022/Day16.scala
+++ b/src/main/scala/eu/sim642/adventofcode2022/Day16.scala
@@ -12,6 +12,7 @@ object Day16 {
 
   case class ValveData(flowRate: Int, tunnels: Seq[Valve])
 
+  // https://en.wikipedia.org/wiki/Transit_node_routing
   def valveDists(valves: Map[Valve, ValveData]): collection.Map[Valve, collection.Map[Valve, Int]] = {
     val dists: mutable.Map[Valve, mutable.Map[Valve, Int]] = valves.view.mapValues(_.tunnels.map(_ -> 1).to(mutable.Map)).to(mutable.Map)
     // Floyd-Warshall
diff --git a/src/main/scala/eu/sim642/adventofcode2022/Day22.scala b/src/main/scala/eu/sim642/adventofcode2022/Day22.scala
index e8ee4811..6f107a46 100644
--- a/src/main/scala/eu/sim642/adventofcode2022/Day22.scala
+++ b/src/main/scala/eu/sim642/adventofcode2022/Day22.scala
@@ -85,6 +85,7 @@ object Day22 {
           case Pos(0, 1) => Pos(pos.x, mapTranspose(pos.x).indexWhere(_ != ' '))
           case Pos(-1, 0) => Pos(map(pos.y).lastIndexWhere(_ != ' '), pos.y)
           case Pos(0, -1) => Pos(pos.x, mapTranspose(pos.x).lastIndexWhere(_ != ' '))
+          case _ => throw new IllegalArgumentException("illegal facing")
         }
         PosFacing(newPos, facing)
       }
@@ -120,6 +121,7 @@ object Day22 {
       case Pos(0, 1) => Pos(edgeLength - 1, edgeLength - 1)
       case Pos(-1, 0) => Pos(0, edgeLength - 1)
       case Pos(0, -1) => Pos(0, 0)
+      case _ => throw new IllegalArgumentException("illegal edge")
     }
 
     def wrap(posFacing: PosFacing): PosFacing = {
diff --git a/src/main/scala/eu/sim642/adventofcode2023/Day7.scala b/src/main/scala/eu/sim642/adventofcode2023/Day7.scala
index 39d01a29..b3077c97 100644
--- a/src/main/scala/eu/sim642/adventofcode2023/Day7.scala
+++ b/src/main/scala/eu/sim642/adventofcode2023/Day7.scala
@@ -17,10 +17,10 @@ object Day7 {
     case HighCard
   }
 
-  val handTypeOrdering: Ordering[HandType] = Ordering.by[HandType, Int](_.ordinal)(Ordering[Int]).reverse
+  val handTypeOrdering: Ordering[HandType] = Ordering.by[HandType, Int](_.ordinal)(using Ordering[Int]).reverse
 
   def handFrequency(hand: Hand): Seq[Int] =
-    hand.groupCount(identity).values.toSeq.sorted(Ordering[Int].reverse)
+    hand.groupCount(identity).values.toSeq.sorted(using Ordering[Int].reverse)
 
   def frequencyHandType(freq: Seq[Int]): HandType = freq match {
     case Seq(5) => HandType.FiveOfAKind
@@ -40,11 +40,11 @@ object Day7 {
 
     def handType(hand: Hand): HandType
 
-    val handOrdering: Ordering[Hand] = Ordering.by(handType)(handTypeOrdering).orElse(Ordering.Implicits.seqOrdering(cardOrdering))
+    val handOrdering: Ordering[Hand] = Ordering.by(handType)(using handTypeOrdering).orElse(Ordering.Implicits.seqOrdering(using cardOrdering))
 
     def totalWinnings(hands: Seq[(Hand, Int)]): Int = {
       hands
-        .sortBy(_._1)(handOrdering)
+        .sortBy(_._1)(using handOrdering)
         .zipWithIndex
         .map({ case ((hand, bid), i) => (i + 1) * bid })
         .sum
diff --git a/src/main/scala/eu/sim642/adventofcode2023/Day8.scala b/src/main/scala/eu/sim642/adventofcode2023/Day8.scala
index afe92524..cec4b453 100644
--- a/src/main/scala/eu/sim642/adventofcode2023/Day8.scala
+++ b/src/main/scala/eu/sim642/adventofcode2023/Day8.scala
@@ -15,6 +15,7 @@ object Day8 {
     instructions.cycle.scanLeft(startNode)({
       case (node, 'L') => network(node)._1
       case (node, 'R') => network(node)._2
+      case _ => throw new IllegalArgumentException("illegal instruction")
     })
   }
 
diff --git a/src/main/scala/eu/sim642/adventofcode2024/Day17.scala b/src/main/scala/eu/sim642/adventofcode2024/Day17.scala
index e96d0952..c0552551 100644
--- a/src/main/scala/eu/sim642/adventofcode2024/Day17.scala
+++ b/src/main/scala/eu/sim642/adventofcode2024/Day17.scala
@@ -102,7 +102,7 @@ object Day17 {
 
   object ReverseEngineeredZ3Part2Solution extends Part2Solution {
     override def findQuineA(input: Input): Long = {
-      val Seq(2, 4, 1, bxl1, 7, 5, 1, bxl2, 4, 5, 0, 3, 5, 5, 3, 0) = input.program // TODO: doesn't support other orders of some operations
+      val Seq(2, 4, 1, bxl1, 7, 5, 1, bxl2, 4, 5, 0, 3, 5, 5, 3, 0) = input.program: @unchecked // TODO: doesn't support other orders of some operations
 
       val ctx = new Context(Map("model" -> "true").asJava)
       import ctx._
@@ -211,7 +211,7 @@ object Day17 {
 
   object ReverseEngineeredPart2Solution extends Part2Solution {
     override def findQuineA(input: Input): Long = {
-      val iterProgram :+ 3 :+ 0 = input.program
+      val iterProgram :+ 3 :+ 0 = input.program: @unchecked
 
       @tailrec
       def helper(as: Set[Long], expectedOutputsRev: List[Byte]): Set[Long] = expectedOutputsRev match {
diff --git a/src/main/scala/eu/sim642/adventofcode2024/Day21.scala b/src/main/scala/eu/sim642/adventofcode2024/Day21.scala
new file mode 100644
index 00000000..9343593f
--- /dev/null
+++ b/src/main/scala/eu/sim642/adventofcode2024/Day21.scala
@@ -0,0 +1,192 @@
+package eu.sim642.adventofcode2024
+
+import eu.sim642.adventofcodelib.Grid
+import eu.sim642.adventofcodelib.GridImplicits.*
+import eu.sim642.adventofcodelib.box.Box
+import eu.sim642.adventofcodelib.graph.*
+import eu.sim642.adventofcodelib.pos.Pos
+
+import scala.collection.mutable
+
+object Day21 {
+
+  type Code = String
+
+  private val numericKeypad: Grid[Char] = Vector(
+    Vector('7', '8', '9'),
+    Vector('4', '5', '6'),
+    Vector('1', '2', '3'),
+    Vector(' ', '0', 'A'),
+  )
+
+  private val directionalKeypad: Grid[Char] = Vector(
+    Vector(' ', '^', 'A'),
+    Vector('<', 'v', '>'),
+  )
+
+  private val directionalOffsets = Map(
+    '^' -> Pos(0, -1),
+    '>' -> Pos(1, 0),
+    'v' -> Pos(0, 1),
+    '<' -> Pos(-1, 0),
+  )
+
+  trait Solution {
+    def shortestSequenceLength(code: Code, directionalKeypads: Int): Long
+
+    def codeComplexity(code: Code, directionalKeypads: Int): Long = {
+      val numericPart = code.dropRight(1).toInt
+      shortestSequenceLength(code, directionalKeypads) * numericPart
+    }
+
+    def sumCodeComplexity(codes: Seq[Code], directionalKeypads: Int): Long = codes.map(codeComplexity(_, directionalKeypads)).sum
+  }
+
+  object NaiveSolution extends Solution {
+
+    case class State(directionalPoss: List[Pos], numericPos: Pos, input: Code) {
+
+      private def numericPress(button: Char): Option[State] = button match {
+        case 'A' =>
+          val newButton = numericKeypad(numericPos)
+          Some(copy(input = input + newButton))
+        case _ =>
+          val offset = directionalOffsets(button)
+          val newNumericPos = numericPos + offset
+          if (numericKeypad.containsPos(newNumericPos) && numericKeypad(newNumericPos) != ' ')
+            Some(copy(numericPos = newNumericPos))
+          else
+            None // out of keypad
+      }
+
+      private def directionalPress(button: Char): Option[State] = directionalPoss match {
+        case Nil => numericPress(button)
+        case directionalPos :: newDirectionalPoss =>
+          button match {
+            case 'A' =>
+              val newButton = directionalKeypad(directionalPos)
+              copy(directionalPoss = newDirectionalPoss).directionalPress(newButton).map(newState =>
+                newState.copy(directionalPoss = directionalPos :: newState.directionalPoss)
+              )
+            case _ =>
+              val offset = directionalOffsets(button)
+              val newDirectionalPos = directionalPos + offset
+              if (directionalKeypad.containsPos(newDirectionalPos) && directionalKeypad(newDirectionalPos) != ' ')
+                Some(copy(directionalPoss = newDirectionalPos :: newDirectionalPoss))
+              else
+                None // out of keypad
+          }
+      }
+
+      def userPress(button: Char): Option[State] = directionalPress(button)
+    }
+
+    override def shortestSequenceLength(code: Code, directionalKeypads: Int): Long = {
+
+      val graphSearch = new GraphSearch[State] with UnitNeighbors[State] {
+        override val startNode: State =
+          State(List.fill(directionalKeypads)(directionalKeypad.posOf('A')), numericKeypad.posOf('A'), "")
+
+        override def unitNeighbors(state: State): IterableOnce[State] = {
+          // TODO: why not flatMap?
+          "<v>^A".iterator.flatten(using state.userPress).filter(newState => code.startsWith(newState.input))
+        }
+
+        override def isTargetNode(state: State, dist: Int): Boolean = state.input == code
+      }
+
+      BFS.search(graphSearch).target.get._2
+    }
+  }
+
+  object DynamicProgrammingSolution extends Solution {
+
+    // copied & modified from 2024 day 10
+    // TODO: extract to library?
+    def pathSearch[A](graphSearch: GraphSearch[A] & UnitNeighbors[A]): GraphSearch[List[A]] & UnitNeighbors[List[A]] = {
+      new GraphSearch[List[A]] with UnitNeighbors[List[A]] {
+        override val startNode: List[A] = List(graphSearch.startNode)
+
+        override def unitNeighbors(node: List[A]): IterableOnce[List[A]] =
+          graphSearch.unitNeighbors(node.head).iterator.map(_ :: node)
+
+        override def isTargetNode(node: List[A], dist: Int): Boolean = graphSearch.isTargetNode(node.head, dist)
+      }
+    }
+
+    private val offsetDirectionals: Map[Pos, Char] = directionalOffsets.map(_.swap)
+
+    private def keypadPaths(keypad: Grid[Char]): Map[(Char, Char), Set[Code]] = {
+      val box = Box(Pos.zero, Pos(keypad(0).size - 1, keypad.size - 1))
+      // TODO: use one traversal per position (to all other positions), instead of pairwise
+      (for {
+        startPos <- box.iterator
+        if keypad(startPos) != ' '
+        targetPos <- box.iterator
+        if keypad(targetPos) != ' '
+      } yield {
+        // TODO: use multi-predecessor BFS to construct all shortest paths
+        val graphSearch = new GraphSearch[Pos] with UnitNeighbors[Pos] with TargetNode[Pos] {
+          override val startNode: Pos = startPos
+
+          override def unitNeighbors(pos: Pos): IterableOnce[Pos] =
+            Pos.axisOffsets.map(pos + _).filter(keypad.containsPos).filter(keypad(_) != ' ')
+
+          override val targetNode: Pos = targetPos
+        }
+        (keypad(targetPos), keypad(startPos)) -> // flipped because paths are reversed
+          SimultaneousBFS.search(pathSearch(graphSearch))
+            .nodes
+            .filter(_.head == targetPos)
+            .map(poss =>
+              (poss lazyZip poss.tail)
+                .map({ (p2, p1) => offsetDirectionals(p1 - p2) })
+                .mkString
+            )
+            .toSet
+      }).toMap
+    }
+
+    private val numericPaths: Map[(Char, Char), Set[Code]] = keypadPaths(numericKeypad)
+    private val directionalPaths: Map[(Char, Char), Set[Code]] = keypadPaths(directionalKeypad)
+
+    def keypadPaths(keypad: Int): Map[(Char, Char), Set[Code]] = if (keypad == 0) numericPaths else directionalPaths
+
+    override def shortestSequenceLength(code: Code, directionalKeypads: Int): Long = {
+      val memo = mutable.Map.empty[(Code, Int), Long]
+
+      def helper(code: Code, keypad: Int): Long = {
+        if (keypad == directionalKeypads + 1)
+          code.length
+        else {
+          memo.getOrElseUpdate((code, keypad), {
+            (("A" + code) lazyZip code) // start moving from A
+              .map({ (prev, cur) =>
+                keypadPaths(keypad)((prev, cur))
+                  .map(path => helper(path + 'A', keypad + 1)) // end at A to press
+                  .min
+              })
+              .sum
+          })
+        }
+      }
+
+      helper(code, 0)
+    }
+  }
+
+  def parseCodes(input: String): Seq[Code] = input.linesIterator.toSeq
+
+  lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day21.txt")).mkString.trim
+
+  val part1DirectionalKeypads = 2
+  val part2DirectionalKeypads = 25
+
+  def main(args: Array[String]): Unit = {
+    import DynamicProgrammingSolution.*
+    println(sumCodeComplexity(parseCodes(input), part1DirectionalKeypads))
+    println(sumCodeComplexity(parseCodes(input), part2DirectionalKeypads))
+
+    // part 2: 1301407762 - too low (Int overflowed in shortestSequenceLength2)
+  }
+}
diff --git a/src/main/scala/eu/sim642/adventofcode2024/Day22.scala b/src/main/scala/eu/sim642/adventofcode2024/Day22.scala
new file mode 100644
index 00000000..83166586
--- /dev/null
+++ b/src/main/scala/eu/sim642/adventofcode2024/Day22.scala
@@ -0,0 +1,52 @@
+package eu.sim642.adventofcode2024
+
+import eu.sim642.adventofcodelib.IteratorImplicits._
+
+object Day22 {
+
+  type Secret = Long
+
+  def mix(secret: Secret, value: Secret): Secret = value ^ secret
+  def prune(secret: Secret): Secret = secret & 0xFFFFFF // % 16777216
+
+  def nextSecret(secret: Secret): Secret = {
+    val secret1 = prune(mix(secret, secret << 6)) // * 64
+    val secret2 = mix(secret1, secret1 >> 5) // / 32, no prune needed after right shift
+    prune(mix(secret2, secret2 << 11)) // * 2048
+  }
+
+  def secretIterator(initialSecret: Secret): Iterator[Secret] =
+    Iterator.iterate(initialSecret)(nextSecret)
+
+  def sumSecretsAfter(secrets: Seq[Secret], after: Int = 2000): Secret =
+    secrets.map(secretIterator(_)(after)).sum
+
+  def mostBananas(secrets: Seq[Secret]): Int = {
+    // TODO: optimize (~4.7s)
+    val secretMaps = secrets
+      .map({ initialSecret =>
+        secretIterator(initialSecret).take(2000 + 1)
+          .map(_ % 10)
+          .map(_.toInt)
+          .sliding(5)
+          .map({ prices =>
+            val changes = (prices lazyZip prices.tail).map((a, b) => b - a)
+            changes -> prices.last
+          })
+          .groupMapReduce(_._1)(_._2)((a, _) => a)
+      })
+    val secretMaps2 = secretMaps
+      .flatten
+      .groupMapReduce(_._1)(_._2)(_ + _)
+    secretMaps2.values.max
+  }
+
+  def parseSecrets(input: String): Seq[Secret] = input.linesIterator.map(_.toLong).toSeq
+
+  lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day22.txt")).mkString.trim
+
+  def main(args: Array[String]): Unit = {
+    println(sumSecretsAfter(parseSecrets(input)))
+    println(mostBananas(parseSecrets(input)))
+  }
+}
diff --git a/src/main/scala/eu/sim642/adventofcode2024/Day23.scala b/src/main/scala/eu/sim642/adventofcode2024/Day23.scala
new file mode 100644
index 00000000..e9e1ec97
--- /dev/null
+++ b/src/main/scala/eu/sim642/adventofcode2024/Day23.scala
@@ -0,0 +1,43 @@
+package eu.sim642.adventofcode2024
+
+import eu.sim642.adventofcodelib.graph.BronKerbosch
+
+object Day23 {
+
+  type Computer = String
+  type Edge = (Computer, Computer)
+
+  def edges2neighbors(edges: Set[Edge]): Map[Computer, Set[Computer]] =
+    (edges ++ edges.map(_.swap)).groupMap(_._1)(_._2)
+
+  def find3Cliques(edges: Set[Edge]): Set[Set[Computer]] = {
+    val neighbors = edges2neighbors(edges)
+    for {
+      (from, to) <- edges
+      third <- neighbors(from) & neighbors(to)
+    } yield Set(from, third, to)
+  }
+
+  def count3CliquesT(edges: Set[Edge]): Int = find3Cliques(edges).count(_.exists(_.startsWith("t")))
+
+  def maximumClique(edges: Set[Edge]): Set[Computer] =
+    BronKerbosch.maximumClique(edges2neighbors(edges))
+
+  def lanPartyPassword(edges: Set[Edge]): String =
+    maximumClique(edges).toSeq.sorted.mkString(",")
+
+  def parseEdge(s: String): Edge = s match {
+    case s"$from-$to" => (from, to)
+  }
+
+  def parseEdges(input: String): Set[Edge] = input.linesIterator.map(parseEdge).toSet
+
+  lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day23.txt")).mkString.trim
+
+  def main(args: Array[String]): Unit = {
+    println(count3CliquesT(parseEdges(input)))
+    println(lanPartyPassword(parseEdges(input)))
+
+    // part 1: 2366 - too high (used contains 't' instead of startsWith 't')
+  }
+}
diff --git a/src/main/scala/eu/sim642/adventofcode2024/Day24.scala b/src/main/scala/eu/sim642/adventofcode2024/Day24.scala
new file mode 100644
index 00000000..696a8efd
--- /dev/null
+++ b/src/main/scala/eu/sim642/adventofcode2024/Day24.scala
@@ -0,0 +1,191 @@
+package eu.sim642.adventofcode2024
+
+import scala.collection.mutable
+
+import eu.sim642.adventofcodelib.IteratorImplicits._
+
+object Day24 {
+
+  enum Op {
+    case And
+    case Or
+    case Xor
+  }
+
+  enum Wire {
+    case Input(value: Boolean)
+    case Gate(lhs: String, op: Op, rhs: String)
+  }
+
+  /**
+   * Exception to indicate cyclic circuit evaluation.
+   * When trying for swaps in part 2, cycles may be introduced, which otherwise (slowly) lead to StackOverflowError.
+   */
+  class CircuitCycleException extends RuntimeException
+
+  case class Circuit(wireMap: Map[String, Wire]) {
+    def zValue: Long = {
+      val memo = mutable.Map.empty[String, Boolean]
+
+      def evalName(name: String, called: Set[String]): Boolean =
+        if (called.contains(name))
+          throw new CircuitCycleException
+        else
+          memo.getOrElseUpdate(name, evalWire(wireMap(name), called + name))
+
+      def evalWire(wire: Wire, called: Set[String]): Boolean = wire match {
+        case Wire.Input(value) => value
+        case Wire.Gate(lhs, op, rhs) =>
+          val left = evalName(lhs, called)
+          val right = evalName(rhs, called)
+          op match {
+            case Op.And => left && right
+            case Op.Or => left || right
+            case Op.Xor => left != right
+          }
+      }
+
+      wireMap.keys
+        .filter(_.startsWith("z"))
+        .toSeq
+        .sorted
+        .foldRight(0L)({ case (zName, acc) =>
+          acc << 1 | (if (evalName(zName, Set.empty)) 1 else 0)
+        })
+    }
+
+    def dependencies(name: String): Set[String] = {
+      val memo = mutable.Map.empty[String, Set[String]]
+
+      def evalName(name: String, called: Set[String]): Set[String] =
+        if (called.contains(name))
+          throw new CircuitCycleException
+        else
+          memo.getOrElseUpdate(name, evalWire(wireMap(name), called + name) + name)
+
+      def evalWire(wire: Wire, called: Set[String]): Set[String] = wire match {
+        case Wire.Input(value) => Set.empty
+        case Wire.Gate(lhs, op, rhs) =>
+          val left = evalName(lhs, called)
+          val right = evalName(rhs, called)
+          left ++ right
+      }
+
+      evalName(name, Set.empty)
+    }
+
+    def swapped(name1: String, name2: String): Circuit =
+      Circuit(wireMap + (name1 -> wireMap(name2)) + (name2 -> wireMap(name1)))
+
+    private def withInputValue(inputPrefix: String, value: Long): Circuit = {
+      val (newCircuit, remainingValue) = wireMap.keys
+        .filter(_.startsWith(inputPrefix))
+        .toSeq
+        .sorted
+        .foldLeft((wireMap, value))({ case ((circuit, value), prefixName) =>
+          (circuit + (prefixName -> Wire.Input((value & 1) == 1L)), value >> 1)
+        })
+      assert(remainingValue == 0)
+      Circuit(newCircuit)
+    }
+
+    def withXValue(value: Long): Circuit = withInputValue("x", value)
+    def withYValue(value: Long): Circuit = withInputValue("y", value)
+
+    def add(xValue: Long, yValue: Long): Long =
+      withXValue(xValue).withYValue(yValue).zValue
+  }
+
+  def findWireSwaps(circuit: Circuit): Seq[(String, String)] = {
+    def isCorrect(circuit: Circuit, i: Int): Boolean = {
+      (for {
+        // must also check previous bit to account for incoming carry
+        xBit <- 0 to 3
+        yBit <- 0 to 3
+        xValue = xBit.toLong << i >> 1
+        yValue = yBit.toLong << i >> 1
+      } yield {
+        try circuit.add(xValue, yValue) == xValue + yValue
+        catch case _: CircuitCycleException => false
+      }).forall(identity)
+    }
+
+    def helper(circuit: Circuit, i: Int, acc: List[(String, String)]): Iterator[List[(String, String)]] = {
+      if (acc.sizeIs > 4)
+        Iterator.empty
+      else if (i > 44)
+        Iterator.single(acc)
+      else if (isCorrect(circuit, i))
+        helper(circuit, i + 1, acc)
+      else {
+        val depsPrev = circuit.dependencies(s"z${i - 1}")
+        val deps = circuit.dependencies(s"z$i")
+        val depsNext = circuit.dependencies(s"z${i + 1}")
+        val depsNext2 = circuit.dependencies(s"z${i + 2}")
+        val wrong1 = ((deps -- depsPrev) ++ (depsNext -- deps)).filterNot(_.startsWith("x")).filterNot(_.startsWith("y"))
+        val wrong2 = (depsNext2 -- depsPrev).filterNot(_.startsWith("x")).filterNot(_.startsWith("y"))
+        val swaps =
+          for {
+            name1 <- wrong1
+            name2 <- wrong2
+            // order names in swap to avoid duplicate checking
+            minName = if (name1 < name2) name1 else name2
+            maxName = if (name1 < name2) name2 else name1
+          } yield (minName, maxName)
+        for {
+          swap@(name1, name2) <- swaps.iterator
+          newCircuit = circuit.swapped(name1, name2)
+          if isCorrect(newCircuit, i)
+          newAcc <- helper(newCircuit, i + 1, swap :: acc)
+        } yield newAcc
+      }
+    }
+
+    val swapss = helper(circuit, 0, Nil)
+    swapss.head
+  }
+
+  def findWireSwapsString(circuit: Circuit): String =
+    findWireSwaps(circuit).flatMap({ case (name1, name2) => Seq(name1, name2) }).sorted.mkString(",")
+
+  def parseInput(s: String): (String, Wire.Input) = s match {
+    case s"$name: 0" => name -> Wire.Input(false)
+    case s"$name: 1" => name -> Wire.Input(true)
+  }
+
+  def parseGate(s: String): (String, Wire.Gate) = s match {
+    case s"$lhs AND $rhs -> $name" => name -> Wire.Gate(lhs, Op.And, rhs)
+    case s"$lhs OR $rhs -> $name" => name -> Wire.Gate(lhs, Op.Or, rhs)
+    case s"$lhs XOR $rhs -> $name" => name -> Wire.Gate(lhs, Op.Xor, rhs)
+  }
+
+  def parseCircuit(input: String): Circuit = input match {
+    case s"$inputs\n\n$gates" =>
+      val inputMap = inputs.linesIterator.map(parseInput).toMap
+      val gateMap = gates.linesIterator.map(parseGate).toMap
+      Circuit(inputMap ++ gateMap)
+  }
+
+  def printCircuitDot(circuit: Circuit): Unit = {
+    println("digraph circuit {")
+    for ((name, wire) <- circuit.wireMap) {
+      wire match {
+        case Wire.Input(value) =>
+          println(s"  $name;")
+        case Wire.Gate(lhs, op, rhs) =>
+          println(s"  $name [label=\"$name $op\"];")
+          println(s"  $lhs -> $name;")
+          println(s"  $rhs -> $name;")
+      }
+    }
+    println("}")
+  }
+
+  lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day24.txt")).mkString.trim
+
+  def main(args: Array[String]): Unit = {
+    val circuit = parseCircuit(input)
+    println(circuit.zValue)
+    println(findWireSwapsString(circuit))
+  }
+}
diff --git a/src/main/scala/eu/sim642/adventofcode2024/Day25.scala b/src/main/scala/eu/sim642/adventofcode2024/Day25.scala
new file mode 100644
index 00000000..6607a194
--- /dev/null
+++ b/src/main/scala/eu/sim642/adventofcode2024/Day25.scala
@@ -0,0 +1,28 @@
+package eu.sim642.adventofcode2024
+
+import eu.sim642.adventofcodelib.Grid
+import eu.sim642.adventofcodelib.GridImplicits._
+
+object Day25 {
+
+  def isKey(grid: Grid[Boolean]): Boolean =
+    grid.head.forall(identity)
+
+  def fits(key: Grid[Boolean], lock: Grid[Boolean]): Boolean =
+    key.correspondsGrid(lock)((k, l) => !(k && l))
+
+  def countLockKeyFits(lockKeys: Seq[Grid[Boolean]]): Int = {
+    val (keys, locks) = lockKeys.partition(isKey)
+    keys.view.map(key => locks.count(fits(key, _))).sum
+  }
+
+  def parseLockKey(s: String): Grid[Boolean] = s.linesIterator.map(_.map(_ == '#').toVector).toVector
+
+  def parseLockKeys(input: String): Seq[Grid[Boolean]] = input.split("\n\n").map(parseLockKey).toSeq
+
+  lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day25.txt")).mkString.trim
+
+  def main(args: Array[String]): Unit = {
+    println(countLockKeyFits(parseLockKeys(input)))
+  }
+}
diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day1.scala b/src/main/scala/eu/sim642/adventofcode2025/Day1.scala
new file mode 100644
index 00000000..cff3aa3e
--- /dev/null
+++ b/src/main/scala/eu/sim642/adventofcode2025/Day1.scala
@@ -0,0 +1,40 @@
+package eu.sim642.adventofcode2025
+
+import eu.sim642.adventofcodelib.IntegralImplicits._
+
+object Day1 {
+
+  trait Part {
+    def password(rotations: Seq[Int]): Int
+  }
+
+  object Part1 extends Part {
+    override def password(rotations: Seq[Int]): Int = {
+      rotations
+        .scanLeft[Int](50)((a, b) => (a + b) %+ 100) // TODO: why can't use implicit arguments?
+        .count(_ == 0)
+    }
+  }
+
+  object Part2 extends Part {
+    override def password(rotations: Seq[Int]): Int = {
+      // expand all rotations to single to make each click observable, this is silly but works
+      val newRotations = rotations.flatMap(i => Seq.fill(i.abs)(i.sign))
+      Part1.password(newRotations)
+    }
+  }
+
+  def parseRotation(s: String): Int = s match {
+    case s"L$i" => -i.toInt
+    case s"R$i" => i.toInt
+  }
+
+  def parseRotations(input: String): Seq[Int] = input.linesIterator.map(parseRotation).toSeq
+
+  lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day1.txt")).mkString.trim
+
+  def main(args: Array[String]): Unit = {
+    println(Part1.password(parseRotations(input)))
+    println(Part2.password(parseRotations(input)))
+  }
+}
diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day10.scala b/src/main/scala/eu/sim642/adventofcode2025/Day10.scala
new file mode 100644
index 00000000..60b6440f
--- /dev/null
+++ b/src/main/scala/eu/sim642/adventofcode2025/Day10.scala
@@ -0,0 +1,169 @@
+package eu.sim642.adventofcode2025
+
+import eu.sim642.adventofcodelib.IteratorImplicits.*
+import com.microsoft.z3.{ArithExpr, Context, IntExpr, IntSort, Status}
+import eu.sim642.adventofcodelib.{GaussianElimination, NumberTheory}
+import eu.sim642.adventofcodelib.graph.{BFS, Dijkstra, GraphSearch, TargetNode, UnitNeighbors}
+
+import scala.collection.mutable
+import scala.jdk.CollectionConverters.*
+
+object Day10 {
+
+  type Lights = Vector[Boolean]
+  type Buttons = Seq[Seq[Int]]
+  type Joltages = Vector[Int]
+
+  case class Machine(lights: Lights, buttons: Buttons, joltages: Joltages)
+
+  trait Part {
+    def fewestPresses(machine: Machine): Int
+
+    def sumFewestPresses(machines: Seq[Machine]): Int = machines.map(fewestPresses).sum
+  }
+
+  object Part1 extends Part {
+    override def fewestPresses(machine: Machine): Int = {
+      val graphSearch = new GraphSearch[Lights] with UnitNeighbors[Lights] with TargetNode[Lights] {
+        override val startNode: Lights = machine.lights.map(_ => false)
+
+        override def unitNeighbors(lights: Lights): IterableOnce[Lights] =
+          machine.buttons.map(_.foldLeft(lights)((acc, i) => acc.updated(i, !acc(i))))
+
+        override val targetNode: Lights = machine.lights
+      }
+
+      BFS.search(graphSearch).target.get._2
+    }
+  }
+
+  trait Part2Solution extends Part
+
+  /**
+   * Solution, which naively finds fewest presses by BFS.
+   * Does not scale to inputs.
+   */
+  object NaivePart2Solution extends Part2Solution {
+    override def fewestPresses(machine: Machine): Int = {
+      val graphSearch = new GraphSearch[Joltages] with UnitNeighbors[Joltages] with TargetNode[Joltages] {
+        override val startNode: Joltages = machine.joltages.map(_ => 0)
+
+        override def unitNeighbors(joltages: Joltages): IterableOnce[Joltages] =
+          machine.buttons.map(_.foldLeft(joltages)((acc, i) => acc.updated(i, acc(i) + 1)))
+
+        override val targetNode: Joltages = machine.joltages
+      }
+
+      BFS.search(graphSearch).target.get._2
+    }
+  }
+
+  /**
+   * Solution, which finds fewest presses via an ILP problem, solved by Z3.
+   */
+  object Z3Part2Solution extends Part2Solution {
+    override def fewestPresses(machine: Machine): Int = {
+      val ctx = new Context(Map("model" -> "true").asJava)
+      import ctx._
+      val s = mkOptimize()
+
+      val buttonPresses = machine.buttons.zipWithIndex.map((_, i) => mkIntConst(s"x$i"))
+      for (presses <- buttonPresses)
+        s.Add(mkGe(presses, mkInt(0)))
+
+      val totalPresses = buttonPresses.foldLeft[ArithExpr[IntSort]](mkInt(0))(mkAdd(_, _))
+      s.MkMinimize(totalPresses)
+
+      (machine.buttons lazyZip buttonPresses)
+        .foldLeft(machine.joltages.map[ArithExpr[IntSort]](mkInt))({ case (acc, (button, presses)) =>
+          button.foldLeft(acc)((acc, i) => acc.updated(i, mkSub(acc(i), presses)))
+        })
+        .foreach(joltageLeft =>
+          s.Add(mkEq(joltageLeft, mkInt(0)))
+        )
+
+      assert(s.Check() == Status.SATISFIABLE)
+      s.getModel.evaluate(totalPresses, false).toString.toInt
+    }
+  }
+
+  /**
+   * Solution, which performs Gaussian elimination and then brute forces free variables in their ranges.
+   */
+  object GaussianEliminationPart2Solution extends Part2Solution {
+    /*
+       x0  x1    x2  x3    x4    x5
+       (3) (1,3) (2) (2,3) (0,2) (0,1)
+    0:                     x4    x5    = 3
+    1:     x1                    x5    = 5
+    2:           x2  x3    x4          = 4
+    3: x0  x1        x3                = 7
+
+
+    0   0   0   0   1   1 | 3
+    0   1   0   0   0   1 | 5
+    0   0   1   1   1   0 | 4
+    1   1   0   1   0   0 | 7
+
+    1   1   0   1   0   0 | 7
+    0   1   0   0   0   1 | 5
+    0   0   1   1   1   0 | 4
+    0   0   0   0   1   1 | 3
+
+    1   0   0   1   0  -1 | 2
+    0   1   0   0   0   1 | 5
+    0   0   1   1   0  -1 | 1
+    0   0   0   0   1   1 | 3
+
+    1   1   1   2   1   0 | 11
+               -1       1 | ?
+    */
+
+    override def fewestPresses(machine: Machine): Int = {
+      val zeroCol = machine.joltages.map(_ => 0)
+      val rows =
+        machine.buttons
+          .map(_.foldLeft(zeroCol)(_.updated(_, 1)))
+          .transpose
+
+      val sol = GaussianElimination.solve(rows, machine.joltages).get
+      //val mSum = m.transpose.map(_.sum) // TODO: use?
+
+      def helper(freeMaxs: List[Int]): Iterator[List[Int]] = freeMaxs match { // TODO: this seems like it should exist from earlier somewhere
+        case Nil => Iterator(Nil)
+        case freeMax :: newFreeMaxs =>
+          for {
+            freeVal <- (0 to freeMax).iterator
+            newFreeVals <- helper(newFreeMaxs)
+          } yield freeVal :: newFreeVals
+      }
+
+      val maxs = machine.buttons.map(_.map(machine.joltages).min)
+      val freeMaxs = sol.freeVars.map(maxs)
+      val dependentMaxs = sol.dependentVars.map(maxs)
+      (for {
+        freeVals <- helper(freeMaxs.toList)
+        dependentVals <- sol.evaluate(freeVals)
+        if dependentVals.forall(_ >= 0)
+        if (dependentVals lazyZip dependentMaxs).forall(_ <= _)
+      } yield dependentVals.sum + freeVals.sum).min
+    }
+  }
+
+  def parseMachine(s: String): Machine = s match {
+    case s"[$lightsStr] $buttonsStr {$joltagesStr}" =>
+      val lights = lightsStr.map(_ == '#').toVector
+      val buttons = buttonsStr.split(" ").map(_.tail.init.split(",").map(_.toInt).toSeq).toSeq
+      val joltages = joltagesStr.split(",").map(_.toInt).toVector
+      Machine(lights, buttons, joltages)
+  }
+
+  def parseMachines(input: String): Seq[Machine] = input.linesIterator.map(parseMachine).toSeq
+
+  lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day10.txt")).mkString.trim
+
+  def main(args: Array[String]): Unit = {
+    println(Part1.sumFewestPresses(parseMachines(input)))
+    println(GaussianEliminationPart2Solution.sumFewestPresses(parseMachines(input)))
+  }
+}
diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day11.scala b/src/main/scala/eu/sim642/adventofcode2025/Day11.scala
new file mode 100644
index 00000000..68539ff3
--- /dev/null
+++ b/src/main/scala/eu/sim642/adventofcode2025/Day11.scala
@@ -0,0 +1,170 @@
+package eu.sim642.adventofcode2025
+
+import scala.annotation.tailrec
+import scala.collection.mutable
+
+object Day11 {
+
+  type Device = String
+  type Devices = Map[Device, Seq[Device]]
+
+  trait PartDevices {
+    val from: Device
+    val via: Set[Device]
+    val to: Device = "out"
+  }
+
+  trait Part1Devices extends PartDevices {
+    override val from: Device = "you"
+    override val via: Set[Device] = Set.empty
+  }
+
+  trait Part2Devices extends PartDevices {
+    override val from: Device = "svr"
+    override val via: Set[Device] = Set("dac", "fft")
+  }
+
+  trait PartSolution extends PartDevices {
+    def countPaths(devices: Devices): Long
+  }
+
+  trait Solution {
+    val Part1: PartSolution
+    val Part2: PartSolution
+  }
+
+  /**
+   * Solution, which counts paths separately for subsets of visited vias.
+   */
+  object ViaMapSolution extends Solution {
+    trait ViaMapPartSolution extends PartSolution {
+      override def countPaths(devices: Devices): Long = {
+        val memo = mutable.Map.empty[Device, Map[Set[Device], Long]]
+
+        def helper(device: Device): Map[Set[Device], Long] = {
+          memo.getOrElseUpdate(device, {
+            val deviceVia = via.intersect(Set(device))
+            if (device == to)
+              Map(deviceVia -> 1)
+            else
+              devices(device).flatMap(helper).groupMapReduce(_._1 ++ deviceVia)(_._2)(_ + _)
+          })
+        }
+
+        helper(from)(via)
+      }
+    }
+
+    override object Part1 extends ViaMapPartSolution with Part1Devices
+    override object Part2 extends ViaMapPartSolution with Part2Devices
+  }
+
+  /**
+   * Optimized version of [[ViaMapSolution]], which only keeps the largest key pair from the mapping.
+   * Others are useless for passing all the vias.
+   * Also, just the size of the visited vias set is tracked, because incompatible sets can't arise.
+   */
+  object ViaPairSolution extends Solution {
+
+    case class ViaPair(via: Int, count: Long) {
+      infix def combine(that: ViaPair): ViaPair = {
+        if (via == that.via)
+          ViaPair(via, count + that.count)
+        else if (via < that.via)
+          that
+        else // that.via < via
+          this
+      }
+
+      def unionVia(thatVia: Int): ViaPair =
+        copy(via = via + thatVia)
+    }
+
+    object ViaPair {
+      val empty = ViaPair(0, 0)
+    }
+
+    trait ViaPairPartSolution extends PartSolution {
+      override def countPaths(devices: Devices): Long = {
+        val memo = mutable.Map.empty[Device, ViaPair]
+
+        def helper(device: Device): ViaPair = {
+          memo.getOrElseUpdate(device, {
+            val deviceVia = if (via(device)) 1 else 0
+            if (device == to)
+              ViaPair(deviceVia, 1)
+            else
+              devices(device).map(helper).foldLeft(ViaPair.empty)(_ combine _).unionVia(deviceVia)
+          })
+        }
+
+        val viaPair = helper(from)
+        assert(viaPair.via == via.size)
+        viaPair.count
+      }
+    }
+
+    override object Part1 extends ViaPairPartSolution with Part1Devices
+    override object Part2 extends ViaPairPartSolution with Part2Devices
+  }
+
+  /**
+   * Solution, which tries all permutations of vias and counts each one by multiplying adjacent steps.
+   */
+  object PermutationSolution extends Solution {
+    trait PermutationPartSolution extends PartSolution {
+      def countPathsTo(devices: Devices)(to: Device): Device => Long = {
+        val memo = mutable.Map.empty[Device, Long]
+
+        def helper(device: Device): Long = {
+          memo.getOrElseUpdate(device, {
+            if (device == to)
+              1
+            else
+              devices.getOrElse(device, Set.empty).map(helper).sum // need getOrElse for "out" when from is different, but reaches "out"
+          })
+        }
+
+        helper
+      }
+
+      override def countPaths(devices: Devices): Long = {
+        val memo = mutable.Map.empty[Device, Device => Long]
+
+        def countPathsFromTo(from: Device, to: Device): Long = // memoize by to, because same to will be reused
+          memo.getOrElseUpdate(to, countPathsTo(devices)(to))(from)
+
+        @tailrec
+        def helper(prevDevice: Device, acc: Long, via: List[Device]): Long = via match {
+          case Nil => acc * countPathsFromTo(prevDevice, to)
+          case device :: newVia =>
+            val newAcc = countPathsFromTo(prevDevice, device)
+            if (newAcc == 0)
+              0 // this step is impossible, so no need to continue (multiplying 0)
+            else
+              helper(device, acc * newAcc, newVia)
+        }
+
+        via.toList.permutations.map(helper(from, 1L, _)).find(_ != 0).get // this could be a sum, but only one vias permutation can be non-zero, so stop after finding that one, no need to continue (adding 0s)
+      }
+    }
+
+    override object Part1 extends PermutationPartSolution with Part1Devices
+    override object Part2 extends PermutationPartSolution with Part2Devices
+  }
+
+  def parseDevice(s: String): (Device, Seq[Device]) = s match {
+    case s"$key: $values" => key -> values.split(" ").toSeq
+  }
+
+  def parseDevices(input: String): Devices = input.linesIterator.map(parseDevice).toMap
+
+  lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day11.txt")).mkString.trim
+
+  def main(args: Array[String]): Unit = {
+    import ViaPairSolution._
+
+    println(Part1.countPaths(parseDevices(input)))
+    println(Part2.countPaths(parseDevices(input)))
+  }
+}
diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day12.scala b/src/main/scala/eu/sim642/adventofcode2025/Day12.scala
new file mode 100644
index 00000000..a15a57f3
--- /dev/null
+++ b/src/main/scala/eu/sim642/adventofcode2025/Day12.scala
@@ -0,0 +1,124 @@
+package eu.sim642.adventofcode2025
+
+import eu.sim642.adventofcodelib.Grid
+import eu.sim642.adventofcodelib.pos.Pos
+import eu.sim642.adventofcodelib.IteratorImplicits.*
+import eu.sim642.adventofcode2020.Day20.OrientationGridOps
+import eu.sim642.adventofcodelib.GridImplicits._
+import eu.sim642.adventofcodelib.box.Box
+
+object Day12 {
+
+  type Shape = Grid[Boolean]
+
+  case class Region(size: Pos, shapeCounts: Seq[Int])
+
+  case class Input(shapes: Seq[Shape], regions: Seq[Region])
+
+  trait Solution {
+    def fits(shapes: Seq[Shape])(region: Region): Boolean
+
+    def countFits(input: Input): Int =
+      input.regions.count(fits(input.shapes))
+  }
+
+  object NaiveSolution extends Solution {
+    override def fits(shapes: Seq[Shape])(region: Region): Boolean = {
+      val shapeOrientationBox = Box(Pos.zero, region.size - Pos(3, 3)) // assuming all shappes of same size
+
+      val shapeOrientations = shapes.map(_.orientations.toSet)
+
+      def helper(grid: Grid[Boolean], shapeCounts: Seq[Int], poss: List[Pos], depth: Int): Boolean = {
+        val indent = " " * depth
+        //println(s"$indent: $shapeCounts")
+        //for (row <- grid) {
+        //  print(indent)
+        //  for (cell <- row)
+        //    print(if (cell) '#' else '.')
+        //  println()
+        //}
+        val shapeI = shapeCounts.indexWhere(_ > 0)
+        if (shapeI < 0)
+          true // nothing more to fit
+        else {
+          if (poss.isEmpty)
+            false
+          else {
+            val pos = poss.head
+            //print(s"$indent $pos")
+            val todo = region.size.x * region.size.y - pos.x * region.size.y - pos.y - (if (pos.x == shapeOrientationBox.max.x) pos.y * 2 else 0)
+            val areaLowerBound = // only counting the #-s in shapes
+              shapes
+                .map(_.countGrid(identity))
+                .lazyZip(shapeCounts)
+                .map(_ * _)
+                .sum
+            if (areaLowerBound > todo) {
+              //println("bounded")
+              false
+            } else {
+              //println()
+              val newPoss = poss.tail
+              (for {
+                ((shapeO, count), shapeI) <- shapeOrientations.lazyZip(shapeCounts).zipWithIndex
+                if count > 0
+                newShapeCounts = shapeCounts.updated(shapeI, count - 1)
+                shapeOrientation <- shapeO.iterator
+                shapeOrientationSize = Pos(shapeOrientation(0).size, shapeOrientation.size)
+                shapeOrientationBox2 = Box(Pos.zero, shapeOrientationSize - Pos(1, 1))
+                if shapeOrientationBox2.iterator.forall(p => !(shapeOrientation(p) && grid(pos + p)))
+                newGrid = shapeOrientationBox2.iterator.foldLeft(grid)((newGrid, p) => newGrid.updatedGrid(pos + p, newGrid(pos + p) || shapeOrientation(p)))
+              } yield helper(newGrid, newShapeCounts, newPoss, depth + 1)).exists(identity) ||
+                !Box(Pos.zero, Pos(2, 2)).iterator.forall(p => !grid(pos + p)) && helper(grid, shapeCounts, newPoss, depth + 1) // or don't place anything here
+            }
+          }
+        }
+      }
+
+      val initialGrid = Vector.fill(region.size.y, region.size.x)(false)
+      helper(initialGrid, region.shapeCounts, shapeOrientationBox.iterator.toList, 0)
+    }
+  }
+
+  object SanitySolution extends Solution {
+    override def fits(shapes: Seq[Shape])(region: Region): Boolean = {
+      val area = Box(Pos(1, 1), region.size).size[Int]
+      val areaLowerBound = // only counting the #-s in shapes
+        shapes
+          .map(_.countGrid(identity))
+          .lazyZip(region.shapeCounts)
+          .map(_ * _)
+          .sum
+      val areaUpperBound = // counting area needed if no "overlaps" are possible
+        shapes
+          .map(_.sizeGrid)
+          .lazyZip(region.shapeCounts)
+          .map(_ * _)
+          .sum
+      if (areaUpperBound <= area)
+        true
+      else if (areaLowerBound > area)
+        false
+      else
+        throw IllegalArgumentException("undecidable by sanity check")
+    }
+  }
+
+  def parseShape(s: String): Shape = s.linesIterator.tail.map(_.map(_ == '#').toVector).toVector
+
+  def parseRegion(s: String): Region = s match {
+    case s"${width}x$height: $shapeCounts" =>
+      Region(Pos(width.toInt, height.toInt), shapeCounts.split(" ").map(_.toInt).toSeq)
+  }
+
+  def parseInput(input: String): Input = {
+    val lineGroups = input.split("\n\n").toSeq
+    Input(lineGroups.init.map(parseShape), lineGroups.last.linesIterator.map(parseRegion).toSeq)
+  }
+
+  lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day12.txt")).mkString.trim
+
+  def main(args: Array[String]): Unit = {
+    println(SanitySolution.countFits(parseInput(input)))
+  }
+}
diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day2.scala b/src/main/scala/eu/sim642/adventofcode2025/Day2.scala
new file mode 100644
index 00000000..9805afff
--- /dev/null
+++ b/src/main/scala/eu/sim642/adventofcode2025/Day2.scala
@@ -0,0 +1,52 @@
+package eu.sim642.adventofcode2025
+
+import eu.sim642.adventofcode2016.Day20.Interval
+
+object Day2 {
+
+  type Range = Interval
+
+  def numDigits(i: Long): Int = {
+    i.toString.length // TODO: already have a (better) way to get number of digits?
+  }
+
+  def invalidIds(times: Int): LazyList[Long] = LazyList.from(1).map(i =>
+    val pow = Math.powExact(10L, numDigits(i))
+    val pattern = (1 until times).foldLeft(1L)((acc, _) => pow * acc + 1)
+    i * pattern
+  )
+
+  trait Part {
+    def maxTimes(max: Long): Int
+
+    def sumInvalidIds(ranges: Seq[Range]): Long = {
+      val max = ranges.map(_.max).max
+      (for {
+        times <- 2 to maxTimes(max) // TODO: bad shadowing
+        id <- invalidIds(times).takeWhile(_ <= max)
+        if ranges.exists(_.contains(id))
+      } yield id).toSet.sum // toSet because some IDs can be created multiple ways (2222 is 2-2-2-2 and 22-22), but shouldn't count multiple times
+    }
+  }
+
+  object Part1 extends Part {
+    override def maxTimes(max: Long): Int = 2
+  }
+
+  object Part2 extends Part {
+    override def maxTimes(max: Long): Int = numDigits(max)
+  }
+
+  def parseRange(s: String): Range = s match {
+    case s"$i-$j" => Interval(i.toLong, j.toLong)
+  }
+
+  def parseRanges(input: String): Seq[Interval] = input.split(",").toSeq.map(parseRange)
+
+  lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day2.txt")).mkString.trim
+
+  def main(args: Array[String]): Unit = {
+    println(Part1.sumInvalidIds(parseRanges(input)))
+    println(Part2.sumInvalidIds(parseRanges(input)))
+  }
+}
diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day3.scala b/src/main/scala/eu/sim642/adventofcode2025/Day3.scala
new file mode 100644
index 00000000..ad3f4afa
--- /dev/null
+++ b/src/main/scala/eu/sim642/adventofcode2025/Day3.scala
@@ -0,0 +1,50 @@
+package eu.sim642.adventofcode2025
+
+import scala.collection.mutable
+
+object Day3 {
+
+  type Bank = String
+
+  def maxJoltageDigits(bank: Bank, digits: Int): Long = {
+    val memo = mutable.Map.empty[(Int, Int), Long]
+
+    def helper(i: Int, digits: Int): Long = {
+      memo.getOrElseUpdate((i, digits), {
+        if (i >= 0 && digits >= 1) {
+          helper(i - 1, digits) max (helper(i - 1, digits - 1) * 10 + bank(i).asDigit)
+        } else
+          0
+      })
+    }
+
+    helper(bank.length - 1, digits)
+  }
+
+  trait Part {
+    val digits: Int
+
+    def maxJoltage(bank: Bank): Long = maxJoltageDigits(bank, digits)
+
+    def totalJoltage(banks: Seq[Bank]): Long = banks.map(maxJoltage).sum
+  }
+
+  object Part1 extends Part {
+    override val digits: Int = 2
+  }
+
+  object Part2 extends Part {
+    override val digits: Int = 12
+  }
+
+  def parseBanks(input: String): Seq[Bank] = input.linesIterator.toSeq
+
+  lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day3.txt")).mkString.trim
+
+  def main(args: Array[String]): Unit = {
+    println(Part1.totalJoltage(parseBanks(input)))
+    println(Part2.totalJoltage(parseBanks(input)))
+
+    // part 1: 16769 - not right (combinations don't keep order)
+  }
+}
diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day4.scala b/src/main/scala/eu/sim642/adventofcode2025/Day4.scala
new file mode 100644
index 00000000..575726ae
--- /dev/null
+++ b/src/main/scala/eu/sim642/adventofcode2025/Day4.scala
@@ -0,0 +1,43 @@
+package eu.sim642.adventofcode2025
+
+import eu.sim642.adventofcodelib.Grid
+import eu.sim642.adventofcodelib.GridImplicits._
+import eu.sim642.adventofcodelib.pos.Pos
+
+object Day4 {
+
+  // TODO: make this more like cellular automaton?
+  def accessibleRolls(grid: Grid[Char]): Seq[Pos] = {
+    (for {
+      (row, y) <- grid.view.zipWithIndex
+      (cell, x) <- row.view.zipWithIndex
+      pos = Pos(x, y)
+      if grid(pos) == '@'
+      neighbors = Pos.allOffsets.map(pos + _).filter(grid.containsPos)
+      if neighbors.count(grid(_) == '@') < 4
+    } yield pos).toSeq
+  }
+
+  def countAccessibleRolls(grid: Grid[Char]): Int = {
+    accessibleRolls(grid).size
+  }
+
+  def countRemovableRolls(grid: Grid[Char]): Int = {
+    val accessible = accessibleRolls(grid)
+    if (accessible.isEmpty)
+      0
+    else {
+      val newGrid = accessible.foldLeft(grid)(_.updatedGrid(_, '.'))
+      accessible.size + countRemovableRolls(newGrid)
+    }
+  }
+
+  def parseGrid(input: String): Grid[Char] = input.linesIterator.map(_.toVector).toVector
+
+  lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day4.txt")).mkString.trim
+
+  def main(args: Array[String]): Unit = {
+    println(countAccessibleRolls(parseGrid(input)))
+    println(countRemovableRolls(parseGrid(input)))
+  }
+}
diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day5.scala b/src/main/scala/eu/sim642/adventofcode2025/Day5.scala
new file mode 100644
index 00000000..16408e86
--- /dev/null
+++ b/src/main/scala/eu/sim642/adventofcode2025/Day5.scala
@@ -0,0 +1,35 @@
+package eu.sim642.adventofcode2025
+
+import eu.sim642.adventofcode2016.Day20.{Interval, mergeIntervals}
+
+object Day5 {
+
+  case class Database(fresh: Seq[Interval], available: Seq[Long])
+
+  def countFreshAvailable(database: Database): Int = {
+    val Database(fresh, available) = database
+    available.count(id => fresh.exists(_.contains(id)))
+  }
+
+  def countFresh(database: Database): Long = {
+    mergeIntervals(database.fresh).map(_.size).sum
+  }
+
+  def parseInterval(s: String): Interval = s match {
+    case s"$i-$j" => Interval(i.toLong, j.toLong)
+  }
+
+  def parseDatabase(input: String): Database = input match {
+    case s"$freshStr\n\n$availableStr" =>
+      val fresh = freshStr.linesIterator.map(parseInterval).toSeq
+      val available = availableStr.linesIterator.map(_.toLong).toSeq
+      Database(fresh, available)
+  }
+
+  lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day5.txt")).mkString.trim
+
+  def main(args: Array[String]): Unit = {
+    println(countFreshAvailable(parseDatabase(input)))
+    println(countFresh(parseDatabase(input)))
+  }
+}
diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day6.scala b/src/main/scala/eu/sim642/adventofcode2025/Day6.scala
new file mode 100644
index 00000000..e04881bf
--- /dev/null
+++ b/src/main/scala/eu/sim642/adventofcode2025/Day6.scala
@@ -0,0 +1,77 @@
+package eu.sim642.adventofcode2025
+
+import Day6.ProblemKind._
+
+object Day6 {
+
+  enum ProblemKind {
+    case Add
+    case Multiply
+  }
+
+  case class Problem(nums: Seq[Int], problemKind: ProblemKind) {
+    def answer: Long = problemKind match {
+      case Add => nums.map(_.toLong).sum
+      case Multiply => nums.map(_.toLong).product
+    }
+  }
+
+  def sumAnswers(problems: Seq[Problem]): Long = {
+    problems.map(_.answer).sum
+  }
+
+  def parseProblemKind(s: String): ProblemKind = s match {
+    case "+" => Add
+    case "*" => Multiply
+  }
+
+  trait Part {
+    def parseProblems(input: String): Seq[Problem]
+  }
+
+  object Part1 extends Part {
+    override def parseProblems(input: String): Seq[Problem] = {
+      input
+        .linesIterator
+        .map(_.trim.split(" +").toSeq)
+        .toSeq
+        .transpose
+        .map(s => Problem(s.init.map(_.toInt), parseProblemKind(s.last)))
+    }
+  }
+
+  object Part2 extends Part {
+    override def parseProblems(input: String): Seq[Problem] = {
+      val lines = input.linesIterator.toSeq
+      val maxLength = lines.map(_.length).max
+      val paddedLines = lines.map(_.padTo(maxLength, ' ')) // pad because test code has trimmed trailing whitespace
+      val cols = paddedLines.transpose
+
+      // TODO: split on Seq?
+      def helper(cols: Seq[Seq[Char]]): List[Problem] = {
+        val (problemCols, newCols) = cols.span(!_.forall(_ == ' '))
+        val problemKind = parseProblemKind(problemCols.head.last.toString)
+        val nums = problemCols.map(_.init.mkString("").trim.toInt)
+        val problem = Problem(nums, problemKind)
+        val rest = {
+          if (newCols.isEmpty)
+            Nil
+          else
+            helper(newCols.tail)
+        }
+        problem :: rest
+      }
+
+      helper(cols)
+    }
+  }
+
+  lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day6.txt")).mkString.trim
+
+  def main(args: Array[String]): Unit = {
+    println(sumAnswers(Part1.parseProblems(input)))
+    println(sumAnswers(Part2.parseProblems(input)))
+
+    // part 1: 1615951811 - too low (Int overflowed in Problem#answer)
+  }
+}
diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day7.scala b/src/main/scala/eu/sim642/adventofcode2025/Day7.scala
new file mode 100644
index 00000000..688f543a
--- /dev/null
+++ b/src/main/scala/eu/sim642/adventofcode2025/Day7.scala
@@ -0,0 +1,65 @@
+package eu.sim642.adventofcode2025
+
+import eu.sim642.adventofcodelib.Grid
+import eu.sim642.adventofcodelib.GridImplicits.*
+import eu.sim642.adventofcodelib.graph.{BFS, GraphTraversal, UnitNeighbors}
+import eu.sim642.adventofcodelib.pos.Pos
+
+import scala.annotation.tailrec
+
+object Day7 {
+
+  private val cellOffsets = Map(
+    'S' -> Seq(Pos(0, 1)),
+    '.' -> Seq(Pos(0, 1)),
+    '^' -> Seq(Pos(-1, 0), Pos(1, 0)),
+  )
+
+  def countBeamSplits(grid: Grid[Char]): Int = {
+    val graphTraversal = new GraphTraversal[Pos] with UnitNeighbors[Pos] {
+      override val startNode: Pos = grid.posOf('S')
+
+      override def unitNeighbors(pos: Pos): IterableOnce[Pos] = {
+        cellOffsets(grid(pos)).map(pos + _).filter(grid.containsPos)
+      }
+    }
+
+    BFS.traverse(graphTraversal)
+      .nodes
+      .count(grid(_) == '^')
+  }
+
+  def countTimelines(grid: Grid[Char]): Long = {
+
+    @tailrec
+    def helper(y: Int, xs: Map[Int, Long]): Long = {
+      if (y >= grid.size)
+        xs.values.sum
+      else {
+        val newXs =
+          (for {
+            (x, count) <- xs.view
+            pos = Pos(x, y)
+            offset <- cellOffsets(grid(pos))
+            newPos = pos + offset
+          } yield newPos.x -> count).groupMapReduce(_._1)(_._2)(_ + _)
+
+        helper(y + 1, newXs)
+      }
+    }
+
+    val startPos = grid.posOf('S')
+    helper(startPos.y, Map(startPos.x -> 1))
+  }
+
+  def parseGrid(input: String): Grid[Char] = input.linesIterator.map(_.toVector).toVector
+
+  lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day7.txt")).mkString.trim
+
+  def main(args: Array[String]): Unit = {
+    println(countBeamSplits(parseGrid(input)))
+    println(countTimelines(parseGrid(input)))
+
+    // part 2: 2012790981 (Int overflowed in countTimelines)
+  }
+}
diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day8.scala b/src/main/scala/eu/sim642/adventofcode2025/Day8.scala
new file mode 100644
index 00000000..610a998e
--- /dev/null
+++ b/src/main/scala/eu/sim642/adventofcode2025/Day8.scala
@@ -0,0 +1,68 @@
+package eu.sim642.adventofcode2025
+
+import eu.sim642.adventofcodelib.IteratorImplicits.*
+import eu.sim642.adventofcodelib.graph.Kruskal
+import eu.sim642.adventofcodelib.pos.Pos3
+
+import scala.collection.mutable
+
+object Day8 {
+
+  extension (pos: Pos3) {
+    infix def euclideanDistanceSqr(that: Pos3): Long = {
+      val d = that - pos
+      d.x.toLong * d.x + d.y.toLong * d.y + d.z.toLong * d.z
+    }
+  }
+
+  extension [A](queue: mutable.PriorityQueue[A]) {
+    // normal queue.iterator does not yield dequeue order
+    def dequeueIterator: Iterator[A] = new Iterator[A] {
+      override def hasNext: Boolean = queue.nonEmpty
+
+      override def next(): A = queue.dequeue()
+    }
+  }
+
+  def iterateClosestPairs(junctionBoxes: Seq[Pos3]): Iterator[(Pos3, Pos3)] = {
+    // it is faster to use a PriorityQueue than sort the Seq of all pairs because Kruskal will only need some closest pairs, not all
+    val queue = mutable.PriorityQueue.empty[((Pos3, Pos3), Long)](using Ordering.by(-_._2))
+    for {
+      // faster than combinations(2)
+      (p1, i) <- junctionBoxes.iterator.zipWithIndex
+      p2 <- junctionBoxes.view.slice(i + 1, junctionBoxes.size).iterator
+    } queue.enqueue((p1, p2) -> (p1 euclideanDistanceSqr p2)) // no need to sqrt distance just for sorting
+    queue.dequeueIterator.map(_._1)
+  }
+
+  def multiplySizesAfter(junctionBoxes: Seq[Pos3], after: Int = 1000, sizes: Int = 3): Int = {
+    val closestPairs = iterateClosestPairs(junctionBoxes)
+    val (ufAfter, _) = Kruskal.iterate(junctionBoxes, closestPairs)(after)
+
+    ufAfter.rootNodes
+      .map(_.size)
+      .toSeq
+      .sorted(using Ordering.Int.reverse)
+      .take(sizes)
+      .product
+  }
+
+  def multiplyLastXs(junctionBoxes: Seq[Pos3]): Int = {
+    val closestPairs = iterateClosestPairs(junctionBoxes)
+    val (p1, p2) = Kruskal.iterateEdges(junctionBoxes, closestPairs).last
+    p1.x * p2.x
+  }
+
+  def parseJunctionBox(s: String): Pos3 = s match {
+    case s"$x,$y,$z" => Pos3(x.toInt, y.toInt, z.toInt)
+  }
+
+  def parseJunctionBoxes(input: String): Seq[Pos3] = input.linesIterator.map(parseJunctionBox).toSeq
+
+  lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day8.txt")).mkString.trim
+
+  def main(args: Array[String]): Unit = {
+    println(multiplySizesAfter(parseJunctionBoxes(input)))
+    println(multiplyLastXs(parseJunctionBoxes(input)))
+  }
+}
diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day9.scala b/src/main/scala/eu/sim642/adventofcode2025/Day9.scala
new file mode 100644
index 00000000..71a3e198
--- /dev/null
+++ b/src/main/scala/eu/sim642/adventofcode2025/Day9.scala
@@ -0,0 +1,157 @@
+package eu.sim642.adventofcode2025
+
+import eu.sim642.adventofcode2018.Day11.SumGrid
+import eu.sim642.adventofcodelib.SeqImplicits.*
+import eu.sim642.adventofcodelib.box.Box
+import eu.sim642.adventofcodelib.graph.{BFS, GraphTraversal, UnitNeighbors}
+import eu.sim642.adventofcodelib.pos.Pos
+
+import scala.collection.mutable
+
+object Day9 {
+
+  trait Part {
+    def makeIsValid(redTiles: Seq[Pos]): Box => Boolean
+
+    def largestArea(redTiles: Seq[Pos]): Long = {
+      val isValid = makeIsValid(redTiles)
+
+      (for {
+        // faster than combinations(2)
+        (p1, i) <- redTiles.iterator.zipWithIndex
+        p2 <- redTiles.view.slice(i + 1, redTiles.size).iterator
+        box = Box.bounding(Seq(p1, p2))
+        if isValid(box)
+      } yield box.size[Long]).max
+    }
+  }
+
+  object Part1 extends Part {
+    override def makeIsValid(redTiles: Seq[Pos]): Box => Boolean =
+      _ => true
+  }
+
+  trait Part2Solution extends Part
+
+  // Copied & modified from 2018 day 11
+  class ArrayPartialSumGrid(f: Pos => Int, box: Box) extends SumGrid {
+    val Box(min, max) = box
+    val Pos(width, height) = max - min + Pos(1, 1)
+    val partialSums: mutable.ArraySeq[mutable.ArraySeq[Int]] = mutable.ArraySeq.fill(height + 1, width + 1)(0) // larger by 1 to allow min-coordinate queries
+
+    for (y <- 1 until height + 1) {
+      for (x <- 1 until width + 1) {
+        val pos = min + Pos(x - 1, y - 1)
+        val sum = partialSums(y - 1)(x) + partialSums(y)(x - 1) - partialSums(y - 1)(x - 1) + f(pos)
+        partialSums(y)(x) = sum
+      }
+    }
+
+    override def sumBox(box: Box): Int = {
+      //val Box(topLeft, bottomRight) = box
+      val topLeft = box.min - min + Pos(1, 1)
+      val bottomRight = box.max - min + Pos(1, 1)
+      val bottomLeft1 = Pos(topLeft.x - 1, bottomRight.y)
+      val topRight1 = Pos(bottomRight.x, topLeft.y - 1)
+      val topLeft1 = Pos(topLeft.x - 1, topLeft.y - 1)
+      partialSums(bottomRight.y)(bottomRight.x) - partialSums(bottomLeft1.y)(bottomLeft1.x) - partialSums(topRight1.y)(topRight1.x) + partialSums(topLeft1.y)(topLeft1.x)
+    }
+  }
+
+  /**
+   * Solution, which compresses the grid to 2-unit distances between occurring coordinates
+   * and checks validity by counting outside cells (in the compressed grid) using a [[SumGrid]].
+   *
+   * Grid compression assumes no adjacent coordinates occur.
+   */
+  object CompressGridPart2Solution extends Part2Solution {
+    def makeCompressPos(redTiles: Seq[Pos]): Pos => Pos = {
+      val xs = redTiles.map(_.x).distinct.sorted
+      val ys = redTiles.map(_.y).distinct.sorted
+
+      p =>
+        Pos(xs.indexOf(p.x) * 2 + 1, ys.indexOf(p.y) * 2 + 1) // leave edge around for fill
+      // it's much faster to do the +1-s here than add Pos(1, 1) below
+    }
+
+    override def makeIsValid(redTiles: Seq[Pos]): Box => Boolean = {
+      val compressPos = makeCompressPos(redTiles)
+      def compressBox(box: Box): Box =
+        Box(compressPos(box.min), compressPos(box.max))
+
+      val originalBox = Box.bounding(redTiles)
+      val compressedBox@Box(_, compressedMax) = compressBox(originalBox)
+
+      val grid = mutable.ArraySeq.fill(compressedMax.y + 2, compressedMax.x + 2)(false) // leave edge around for fill
+      // TODO: why need +2?
+      for ((redTile1, redTile2) <- redTiles lazyZip redTiles.rotateLeft(1)) {
+        for (pos <- compressBox(Box.bounding(Seq(redTile1, redTile2))).iterator)
+          grid(pos.y)(pos.x) = true
+      }
+      //for (row <- grid) {
+      //  for (cell <- row)
+      //    print(cell)
+      //  println()
+      //}
+
+      val graphTraversal = new GraphTraversal[Pos] with UnitNeighbors[Pos] {
+        override val startNode: Pos = Pos.zero
+
+        override def unitNeighbors(pos: Pos): IterableOnce[Pos] =
+          Pos.axisOffsets.map(pos + _).filter(p => p.x >= 0 && p.y >= 0 && p.y < grid.size && p.x < grid(p.y).size && !grid(p.y)(p.x))
+      }
+      val outside = BFS.traverse(graphTraversal).nodes
+
+      val outsideSumGrid = new ArrayPartialSumGrid(pos => if (outside(pos)) 1 else 0, compressedBox)
+      def isValid(box: Box): Boolean = {
+        val compressedBox = Box(compressPos(box.min), compressPos(box.max))
+        //!compressedBox.iterator.exists(outside)
+        outsideSumGrid.sumBox(compressedBox) == 0
+      }
+
+      isValid
+    }
+  }
+
+  /**
+   * Solution, which checks validity geometrically using axis-aligned line-box intersection.
+   *
+   * Assumes largest area won't be outside.
+   * Assumes no adjacent coordinates occur.
+   */
+  object IntersectionPart2Solution extends Part2Solution {
+    override def makeIsValid(redTiles: Seq[Pos]): Box => Boolean = {
+      val lines =
+        (redTiles lazyZip redTiles.rotateLeft(1))
+          .toSeq
+          .map((p1, p2) => Box.bounding(Seq(p1, p2))) // convert line to box of width/height 1
+
+      def isValid(box: Box): Boolean = {
+        // construct box interior, otherwise box intersects with its own edges
+        val innerMin = box.min + Pos(1, 1)
+        val innerMax = box.max - Pos(1, 1)
+        //innerMin <= innerMax &&
+        !(innerMin <= innerMax) || // box has no/empty interior // TODO: this is wrong for line-line intersections
+          !lines.exists(_.intersect(Box(innerMin, innerMax)).nonEmpty) // interior doesn't intersect any line
+      }
+
+      isValid
+    }
+  }
+
+  // TODO: line of sight in all directions solution (single iteration over corners, not all pairs!)
+  // TODO: glguy's solution
+
+  def parseRedTile(s: String): Pos = s match {
+    case s"$x,$y" => Pos(x.toInt, y.toInt)
+  }
+
+  def parseRedTiles(input: String): Seq[Pos] = input.linesIterator.map(parseRedTile).toSeq
+
+  lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day9.txt")).mkString.trim
+
+  def main(args: Array[String]): Unit = {
+    println(Part1.largestArea(parseRedTiles(input)))
+    println(CompressGridPart2Solution.largestArea(parseRedTiles(input)))
+  }
+}
diff --git a/src/main/scala/eu/sim642/adventofcodelib/GaussianElimination.scala b/src/main/scala/eu/sim642/adventofcodelib/GaussianElimination.scala
new file mode 100644
index 00000000..966397bb
--- /dev/null
+++ b/src/main/scala/eu/sim642/adventofcodelib/GaussianElimination.scala
@@ -0,0 +1,124 @@
+package eu.sim642.adventofcodelib
+
+import eu.sim642.adventofcodelib.IntegralImplicits.ExtraDivModIntegralOps
+
+import scala.collection.mutable
+import scala.math.Integral.Implicits.infixIntegralOps
+import scala.math.Ordering.Implicits.infixOrderingOps
+import scala.reflect.ClassTag
+import scala.util.boundary
+import scala.util.boundary.break
+
+/**
+ * Integer-only Gaussian elimination.
+ */
+object GaussianElimination {
+
+  case class Solution[A: Integral](dependentVars: Seq[Int], dependentGenerator: Seq[A],
+                                   freeVars: Seq[Int], freeGenerators: Seq[Seq[A]],
+                                   constGenerator: Seq[A]) {
+    private lazy val freeGeneratorsTransposed = { // transpose of empty generators needs right length for lazyZip to work below
+      if (freeGenerators.isEmpty)
+        constGenerator.map(_ => Nil)
+      else
+        freeGenerators.transpose
+    }
+
+    require(dependentGenerator.size == constGenerator.size)
+    require(dependentGenerator.size == freeGeneratorsTransposed.size)
+
+    def evaluate(freeVals: Seq[A]): Option[Seq[A]] = {
+      boundary { // poor man's sequence
+        Some((constGenerator lazyZip freeGeneratorsTransposed lazyZip dependentGenerator).map((const, freeCoeffs, dependentCoeff) => {
+          val r = const - (freeCoeffs lazyZip freeVals).map(_ * _).sum
+          (r /! dependentCoeff).getOrElse(break(None))
+        }))
+      }
+    }
+  }
+
+  def solve[A: ClassTag](initialA: Seq[Seq[A]], initialb: Seq[A])(using aIntegral: Integral[A]): Option[Solution[A]] = {
+    val m = initialA.size
+    val n = initialA.head.size
+    require(initialb.sizeIs == m)
+
+    val A: mutable.ArraySeq[mutable.ArraySeq[A]] = initialA.map(_.to(mutable.ArraySeq)).to(mutable.ArraySeq)
+    val b: mutable.ArraySeq[A] = initialb.to(mutable.ArraySeq)
+
+    def swapRows(y1: Int, y2: Int): Unit = {
+      val A1 = A(y1)
+      A(y1) = A(y2)
+      A(y2) = A1
+      val b1 = b(y1)
+      b(y1) = b(y2)
+      b(y2) = b1
+    }
+
+    def simplifyRow(y: Int): Unit = {
+      val factor = NumberTheory.gcd(NumberTheory.gcd(A(y).toSeq), b(y)) // TODO: avoid conversion
+      if (factor.abs > summon[Integral[A]].one) {
+        A(y).mapInPlace(_ / factor)
+        b(y) /= factor
+      }
+    }
+
+    def reduceRow(x: Int, y1: Int, y2: Int): Unit = {
+      val c2 = A(y2)(x)
+      if (c2 != 0) {
+        val c1 = A(y1)(x)
+        val (factor1, factor2) = NumberTheory.extendedGcd(c1, c2)._3
+        for (x2 <- 0 until x) // must start from 0 because we're now multiplying entire row y2
+          A(y2)(x2) = factor2 * A(y2)(x2)
+        for (x2 <- x until n)
+          A(y2)(x2) = factor2 * A(y2)(x2) + factor1 * A(y1)(x2)
+        b(y2) = factor2 * b(y2) + factor1 * b(y1)
+        //simplifyRow(y2) // TODO: helps?
+      }
+    }
+
+    // forward elimination
+    var y = 0
+    for (x <- 0 until n) {
+      (y until m).find(A(_)(x) != 0) match {
+        case None => // move to next x
+        case Some(y2) =>
+          swapRows(y, y2)
+          for (y3 <- (y + 1) until m)
+            reduceRow(x, y, y3)
+          y += 1
+      }
+    }
+
+    boundary {
+      // check consistency
+      for (y2 <- y until b.size) {
+        if (b(y2) != 0)
+          break(None)
+      }
+
+      // backward elimination
+      val dependentVars = mutable.ArrayBuffer.empty[Int]
+      val freeVars = mutable.ArrayBuffer.empty[Int]
+      y = 0
+      for (x <- 0 until n) {
+        if (y >= m || A(y)(x) == 0)
+          freeVars += x
+        else {
+          dependentVars += x
+          for (y2 <- 0 until y)
+            reduceRow(x, y, y2)
+          y += 1
+        }
+      }
+
+      val Aview = A.view.take(dependentVars.size)
+      Some(Solution(
+        dependentVars = dependentVars.toSeq,
+        dependentGenerator = (A lazyZip dependentVars).map(_(_)).toSeq,
+        freeVars = freeVars.toSeq,
+        freeGenerators = freeVars.view.map(x => Aview.map(_(x)).toSeq).toSeq,
+        constGenerator = b.view.take(dependentVars.size).toSeq
+      ))
+    }
+  }
+}
diff --git a/src/main/scala/eu/sim642/adventofcodelib/NumberTheory.scala b/src/main/scala/eu/sim642/adventofcodelib/NumberTheory.scala
index 1b20a557..9f5f736a 100644
--- a/src/main/scala/eu/sim642/adventofcodelib/NumberTheory.scala
+++ b/src/main/scala/eu/sim642/adventofcodelib/NumberTheory.scala
@@ -70,7 +70,7 @@ object NumberTheory {
   }
 
   def sieveCrt[A](ans: Seq[(A, A)])(using aIntegral: Integral[A]): (A, A) = {
-    ans.sortBy(_._2)(aIntegral.reverse)
+    ans.sortBy(_._2)(using aIntegral.reverse)
       .reduceLeft(sieveCrt2(_, _))
   }
 }
diff --git a/src/main/scala/eu/sim642/adventofcodelib/UnionFind.scala b/src/main/scala/eu/sim642/adventofcodelib/UnionFind.scala
new file mode 100644
index 00000000..8cdd6270
--- /dev/null
+++ b/src/main/scala/eu/sim642/adventofcodelib/UnionFind.scala
@@ -0,0 +1,52 @@
+package eu.sim642.adventofcodelib
+
+import eu.sim642.adventofcodelib.UnionFind.Node
+
+import scala.annotation.tailrec
+
+class UnionFind[A](val nodes: Map[A, Node[A]]) {
+
+  def this(xs: Seq[A]) = {
+    this(xs.map(x => x -> Node(x, 1)).toMap)
+  }
+
+  @tailrec
+  final def findReprNode(x: A): Node[A] = {
+    // TODO: path compression
+    val node = nodes(x)
+    if (x == node.parent)
+      node
+    else
+      findReprNode(node.parent)
+  }
+
+  def findRepr(x: A): A = findReprNode(x).parent
+
+  def sameRepr(x: A, y: A): Boolean =
+    findRepr(x) == findRepr(y)
+
+  def unioned(x: A, y: A): UnionFind[A] = {
+    val xNode = findReprNode(x)
+    val yNode = findReprNode(y)
+    val xRepr = xNode.parent
+    val yRepr = yNode.parent
+    if (xRepr == yRepr) // sameRepr inlined
+      this
+    else if (xNode.size >= yNode.size)
+      new UnionFind(nodes + (xRepr -> xNode.copy(size = xNode.size + yNode.size)) + (yRepr -> yNode.copy(parent = xRepr)))
+    else
+      new UnionFind(nodes + (yRepr -> yNode.copy(size = xNode.size + yNode.size)) + (xRepr -> xNode.copy(parent = yRepr)))
+  }
+
+  def components: Iterable[Iterable[A]] =
+    nodes.keys.groupBy(findRepr).values
+
+  def rootNodes: Iterable[Node[A]] =
+    nodes.view.filter((x, node) => x == node.parent).values
+
+  override def toString: String = nodes.toString()
+}
+
+object UnionFind {
+  case class Node[A](parent: A, size: Int)
+}
diff --git a/src/main/scala/eu/sim642/adventofcodelib/graph/AStar.scala b/src/main/scala/eu/sim642/adventofcodelib/graph/AStar.scala
index fe81053a..ce87aa45 100644
--- a/src/main/scala/eu/sim642/adventofcodelib/graph/AStar.scala
+++ b/src/main/scala/eu/sim642/adventofcodelib/graph/AStar.scala
@@ -6,7 +6,7 @@ object AStar {
   // moved from 2018 Day 22
   def search[A](graphSearch: GraphSearch[A] & Heuristic[A]): Distances[A] & Target[A] = {
     val visitedDistance: mutable.Map[A, Int] = mutable.Map.empty
-    val toVisit: mutable.PriorityQueue[(Int, Int, A)] = mutable.PriorityQueue.empty(Ordering.by(-_._1))
+    val toVisit: mutable.PriorityQueue[(Int, Int, A)] = mutable.PriorityQueue.empty(using Ordering.by(-_._1))
 
     def enqueueHeuristically(node: A, dist: Int): Unit = {
       toVisit.enqueue((dist + graphSearch.heuristic(node), dist, node))
diff --git a/src/main/scala/eu/sim642/adventofcodelib/graph/BronKerbosch.scala b/src/main/scala/eu/sim642/adventofcodelib/graph/BronKerbosch.scala
new file mode 100644
index 00000000..fde07173
--- /dev/null
+++ b/src/main/scala/eu/sim642/adventofcodelib/graph/BronKerbosch.scala
@@ -0,0 +1,60 @@
+package eu.sim642.adventofcodelib.graph
+
+object BronKerbosch {
+
+  // unused
+  def maximalCliques[A](neighbors: Map[A, Set[A]]): Iterator[Set[A]] = {
+
+    def bronKerbosch(r: Set[A], p: Set[A], x: Set[A]): Iterator[Set[A]] = {
+      if (p.isEmpty) {
+        if (x.isEmpty)
+          Iterator.single(r)
+        else
+          Iterator.empty
+      }
+      else {
+        //val u = p.headOption.getOrElse(x.head)
+        val u = (p ++ x).maxBy(neighbors(_).size) // pivot on highest degree
+        val vs = (p -- neighbors(u)).iterator
+        Iterator.unfold((p, x))((p, x) => // foldLeftFlatMap
+          vs.nextOption().map(v =>
+            (bronKerbosch(r + v, p intersect neighbors(v), x intersect neighbors(v)), (p - v, x + v))
+          )
+        ).flatten
+      }
+    }
+
+    bronKerbosch(Set.empty, neighbors.keySet, Set.empty)
+  }
+
+  // TODO: would this be slower than direct implementation below?
+  /*def maximumClique[A](neighbors: Map[A, Set[A]]): Set[A] =
+    maximalCliques(neighbors).maxBy(_.size)*/
+
+  // moved from 2018 day 23
+  def maximumClique[A](neighbors: Map[A, Set[A]]): Set[A] = {
+    var best: Set[A] = Set.empty
+
+    def bronKerbosch(r: Set[A], p: Set[A], x: Set[A]): Unit = {
+      if (p.isEmpty && x.isEmpty) {
+        //println(r)
+        if (r.size > best.size)
+          best = r
+      }
+      else {
+        //val u = p.headOption.getOrElse(x.head)
+        val u = (p ++ x).maxBy(neighbors(_).size) // pivot on highest degree
+        var p2 = p
+        var x2 = x
+        for (v <- p -- neighbors(u)) {
+          bronKerbosch(r + v, p2 intersect neighbors(v), x2 intersect neighbors(v))
+          p2 -= v
+          x2 += v
+        }
+      }
+    }
+
+    bronKerbosch(Set.empty, neighbors.keySet, Set.empty)
+    best
+  }
+}
diff --git a/src/main/scala/eu/sim642/adventofcodelib/graph/Dijkstra.scala b/src/main/scala/eu/sim642/adventofcodelib/graph/Dijkstra.scala
index 5503b2fe..b90d5574 100644
--- a/src/main/scala/eu/sim642/adventofcodelib/graph/Dijkstra.scala
+++ b/src/main/scala/eu/sim642/adventofcodelib/graph/Dijkstra.scala
@@ -8,7 +8,7 @@ object Dijkstra {
   // copied from AStar
   def traverse[A](graphTraversal: GraphTraversal[A]): Distances[A] = {
     val visitedDistance: mutable.Map[A, Int] = mutable.Map.empty
-    val toVisit: mutable.PriorityQueue[(Int, A)] = mutable.PriorityQueue.empty(Ordering.by(-_._1))
+    val toVisit: mutable.PriorityQueue[(Int, A)] = mutable.PriorityQueue.empty(using Ordering.by(-_._1))
 
     def enqueue(node: A, dist: Int): Unit = {
       toVisit.enqueue((dist, node))
@@ -40,7 +40,7 @@ object Dijkstra {
   // copied from AStar
   def search[A](graphSearch: GraphSearch[A]): Distances[A] & Target[A] = {
     val visitedDistance: mutable.Map[A, Int] = mutable.Map.empty
-    val toVisit: mutable.PriorityQueue[(Int, A)] = mutable.PriorityQueue.empty(Ordering.by(-_._1))
+    val toVisit: mutable.PriorityQueue[(Int, A)] = mutable.PriorityQueue.empty(using Ordering.by(-_._1))
 
     def enqueue(node: A, dist: Int): Unit = {
       toVisit.enqueue((dist, node))
diff --git a/src/main/scala/eu/sim642/adventofcodelib/graph/Kruskal.scala b/src/main/scala/eu/sim642/adventofcodelib/graph/Kruskal.scala
new file mode 100644
index 00000000..00d52232
--- /dev/null
+++ b/src/main/scala/eu/sim642/adventofcodelib/graph/Kruskal.scala
@@ -0,0 +1,19 @@
+package eu.sim642.adventofcodelib.graph
+
+import eu.sim642.adventofcodelib.UnionFind
+
+object Kruskal {
+
+  def iterate[A](nodes: Seq[A], sortedEdges: IterableOnce[(A, A)]): Iterator[(UnionFind[A], Option[(A, A)])] = {
+    sortedEdges.iterator
+      .scanLeft((new UnionFind(nodes), Option.empty[(A, A)]))({ case ((uf, _), edge@(p1, p2)) =>
+        if (uf.sameRepr(p1, p2))
+          (uf, None)
+        else
+          (uf.unioned(p1, p2), Some(edge))
+      })
+  }
+
+  def iterateEdges[A](nodes: Seq[A], sortedEdges: IterableOnce[(A, A)]): Iterator[(A, A)] =
+    iterate(nodes, sortedEdges).flatMap(_._2).take(nodes.size - 1)
+}
diff --git a/src/main/scala/eu/sim642/adventofcodelib/graph/NaiveTSP.scala b/src/main/scala/eu/sim642/adventofcodelib/graph/NaiveTSP.scala
index 43b3370f..5e46d162 100644
--- a/src/main/scala/eu/sim642/adventofcodelib/graph/NaiveTSP.scala
+++ b/src/main/scala/eu/sim642/adventofcodelib/graph/NaiveTSP.scala
@@ -19,7 +19,7 @@ object NaiveTSP {
       .permutations
       .map({ path =>
         totalPathLength(distanceMatrix, path)
-      }).min(lengthOrdering)
+      }).min(using lengthOrdering)
   }
 
   // moved from 2016 Day 24
@@ -29,7 +29,7 @@ object NaiveTSP {
       .map({ path =>
         distanceMatrix(start)(path.head) +
           totalPathLength(distanceMatrix, path)
-      }).min(lengthOrdering)
+      }).min(using lengthOrdering)
   }
 
   // moved from 2016 Day 24
@@ -40,7 +40,7 @@ object NaiveTSP {
         distanceMatrix(start)(path.head) +
           totalPathLength(distanceMatrix, path) +
           distanceMatrix(path.last)(start)
-      }).min(lengthOrdering)
+      }).min(using lengthOrdering)
   }
 
   def cycleLength[A](distanceMatrix: DistanceMatrix[A])(using lengthOrdering: Ordering[Int]): Int = {
diff --git a/src/test/scala/eu/sim642/adventofcode2024/Day21Test.scala b/src/test/scala/eu/sim642/adventofcode2024/Day21Test.scala
new file mode 100644
index 00000000..f8cb30aa
--- /dev/null
+++ b/src/test/scala/eu/sim642/adventofcode2024/Day21Test.scala
@@ -0,0 +1,55 @@
+package eu.sim642.adventofcode2024
+
+import Day21.*
+import Day21Test.*
+import org.scalatest.Suites
+import org.scalatest.funsuite.AnyFunSuite
+
+class Day21Test extends Suites(
+  new NaiveSolutionTest,
+  new DynamicProgrammingSolutionTest,
+)
+
+object Day21Test {
+
+  val exampleInput =
+    """029A
+      |980A
+      |179A
+      |456A
+      |379A""".stripMargin
+
+  abstract class SolutionTest(solution: Solution) extends AnyFunSuite {
+    import solution._
+
+    test("Part 1 examples") {
+      assert(shortestSequenceLength("029A", 0) == "<A^A>^^AvvvA".length)
+      assert(shortestSequenceLength("029A", 1) == "v<<A>>^A<A>AvA<^AA>A<vAAA>^A".length)
+      assert(shortestSequenceLength("029A", 2) == "<vA<AA>>^AvAA<^A>A<v<A>>^AvA^A<vA>^A<v<A>^A>AAvA^A<v<A>A>^AAAvA<^A>A".length)
+
+      assert(sumCodeComplexity(parseCodes(exampleInput), part1DirectionalKeypads) == 126384)
+    }
+
+    test("Part 1 input answer") {
+      assert(sumCodeComplexity(parseCodes(input), part1DirectionalKeypads) == 157892)
+    }
+
+    protected val testPart2: Boolean = true
+
+    if (testPart2) {
+      test("Part 2 examples") {
+        assert(sumCodeComplexity(parseCodes(exampleInput), part2DirectionalKeypads) == 154115708116294L) // not in text
+      }
+
+      test("Part 2 input answer") {
+        assert(sumCodeComplexity(parseCodes(input), part2DirectionalKeypads) == 197015606336332L)
+      }
+    }
+  }
+
+  class NaiveSolutionTest extends SolutionTest(NaiveSolution) {
+    override protected val testPart2: Boolean = false
+  }
+
+  class DynamicProgrammingSolutionTest extends SolutionTest(DynamicProgrammingSolution)
+}
diff --git a/src/test/scala/eu/sim642/adventofcode2024/Day22Test.scala b/src/test/scala/eu/sim642/adventofcode2024/Day22Test.scala
new file mode 100644
index 00000000..6867475f
--- /dev/null
+++ b/src/test/scala/eu/sim642/adventofcode2024/Day22Test.scala
@@ -0,0 +1,56 @@
+package eu.sim642.adventofcode2024
+
+import Day22.*
+import org.scalatest.funsuite.AnyFunSuite
+import org.scalatestplus.scalacheck.ScalaCheckPropertyChecks
+
+class Day22Test extends AnyFunSuite with ScalaCheckPropertyChecks {
+
+  val exampleInput =
+    """1
+      |10
+      |100
+      |2024""".stripMargin
+
+  val exampleInput2 =
+    """1
+      |2
+      |3
+      |2024""".stripMargin
+
+  test("Part 1 examples") {
+    val secrets = Table(
+      "secret",
+      123,
+      15887950,
+      16495136,
+      527345,
+      704524,
+      1553684,
+      12683156,
+      11100544,
+      12249484,
+      7753432,
+      5908254,
+    )
+
+    val it = secretIterator(123)
+    forAll (secrets) { secret =>
+      assert(it.next() == secret)
+    }
+
+    assert(sumSecretsAfter(parseSecrets(exampleInput)) == 37327623)
+  }
+
+  test("Part 1 input answer") {
+    assert(sumSecretsAfter(parseSecrets(input)) == 21147129593L)
+  }
+
+  test("Part 2 examples") {
+    assert(mostBananas(parseSecrets(exampleInput2)) == 23)
+  }
+
+  test("Part 2 input answer") {
+    assert(mostBananas(parseSecrets(input)) == 2445)
+  }
+}
diff --git a/src/test/scala/eu/sim642/adventofcode2024/Day23Test.scala b/src/test/scala/eu/sim642/adventofcode2024/Day23Test.scala
new file mode 100644
index 00000000..e58c66b1
--- /dev/null
+++ b/src/test/scala/eu/sim642/adventofcode2024/Day23Test.scala
@@ -0,0 +1,57 @@
+package eu.sim642.adventofcode2024
+
+import Day23._
+import org.scalatest.funsuite.AnyFunSuite
+
+class Day23Test extends AnyFunSuite {
+
+  val exampleInput =
+    """kh-tc
+      |qp-kh
+      |de-cg
+      |ka-co
+      |yn-aq
+      |qp-ub
+      |cg-tb
+      |vc-aq
+      |tb-ka
+      |wh-tc
+      |yn-cg
+      |kh-ub
+      |ta-co
+      |de-co
+      |tc-td
+      |tb-wq
+      |wh-td
+      |ta-ka
+      |td-qp
+      |aq-cg
+      |wq-ub
+      |ub-vc
+      |de-ta
+      |wq-aq
+      |wq-vc
+      |wh-yn
+      |ka-de
+      |kh-ta
+      |co-tc
+      |wh-qp
+      |tb-vc
+      |td-yn""".stripMargin
+
+  test("Part 1 examples") {
+    assert(count3CliquesT(parseEdges(exampleInput)) == 7)
+  }
+
+  test("Part 1 input answer") {
+    assert(count3CliquesT(parseEdges(input)) == 1437)
+  }
+
+  test("Part 2 examples") {
+    assert(lanPartyPassword(parseEdges(exampleInput)) == "co,de,ka,ta")
+  }
+
+  test("Part 2 input answer") {
+    assert(lanPartyPassword(parseEdges(input)) == "da,do,gx,ly,mb,ns,nt,pz,sc,si,tp,ul,vl")
+  }
+}
diff --git a/src/test/scala/eu/sim642/adventofcode2024/Day24Test.scala b/src/test/scala/eu/sim642/adventofcode2024/Day24Test.scala
new file mode 100644
index 00000000..e08de7b2
--- /dev/null
+++ b/src/test/scala/eu/sim642/adventofcode2024/Day24Test.scala
@@ -0,0 +1,81 @@
+package eu.sim642.adventofcode2024
+
+import Day24._
+import org.scalatest.funsuite.AnyFunSuite
+
+class Day24Test extends AnyFunSuite {
+
+  val exampleInput =
+    """x00: 1
+      |x01: 1
+      |x02: 1
+      |y00: 0
+      |y01: 1
+      |y02: 0
+      |
+      |x00 AND y00 -> z00
+      |x01 XOR y01 -> z01
+      |x02 OR y02 -> z02""".stripMargin
+
+  val exampleInput2 =
+    """x00: 1
+      |x01: 0
+      |x02: 1
+      |x03: 1
+      |x04: 0
+      |y00: 1
+      |y01: 1
+      |y02: 1
+      |y03: 1
+      |y04: 1
+      |
+      |ntg XOR fgs -> mjb
+      |y02 OR x01 -> tnw
+      |kwq OR kpj -> z05
+      |x00 OR x03 -> fst
+      |tgd XOR rvg -> z01
+      |vdt OR tnw -> bfw
+      |bfw AND frj -> z10
+      |ffh OR nrd -> bqk
+      |y00 AND y03 -> djm
+      |y03 OR y00 -> psh
+      |bqk OR frj -> z08
+      |tnw OR fst -> frj
+      |gnj AND tgd -> z11
+      |bfw XOR mjb -> z00
+      |x03 OR x00 -> vdt
+      |gnj AND wpb -> z02
+      |x04 AND y00 -> kjc
+      |djm OR pbm -> qhw
+      |nrd AND vdt -> hwm
+      |kjc AND fst -> rvg
+      |y04 OR y02 -> fgs
+      |y01 AND x02 -> pbm
+      |ntg OR kjc -> kwq
+      |psh XOR fgs -> tgd
+      |qhw XOR tgd -> z09
+      |pbm OR djm -> kpj
+      |x03 XOR y03 -> ffh
+      |x00 XOR y04 -> ntg
+      |bfw OR bqk -> z06
+      |nrd XOR fgs -> wpb
+      |frj XOR qhw -> z04
+      |bqk OR frj -> z07
+      |y03 OR x01 -> nrd
+      |hwm AND bqk -> z03
+      |tgd XOR rvg -> z12
+      |tnw OR pbm -> gnj""".stripMargin
+
+  test("Part 1 examples") {
+    assert(parseCircuit(exampleInput).zValue == 4)
+    assert(parseCircuit(exampleInput2).zValue == 2024)
+  }
+
+  test("Part 1 input answer") {
+    assert(parseCircuit(input).zValue == 51410244478064L)
+  }
+
+  test("Part 2 input answer") {
+    assert(findWireSwapsString(parseCircuit(input)) == "gst,khg,nhn,tvb,vdc,z12,z21,z33")
+  }
+}
diff --git a/src/test/scala/eu/sim642/adventofcode2024/Day25Test.scala b/src/test/scala/eu/sim642/adventofcode2024/Day25Test.scala
new file mode 100644
index 00000000..081714fa
--- /dev/null
+++ b/src/test/scala/eu/sim642/adventofcode2024/Day25Test.scala
@@ -0,0 +1,56 @@
+package eu.sim642.adventofcode2024
+
+import Day25._
+import org.scalatest.funsuite.AnyFunSuite
+
+class Day25Test extends AnyFunSuite {
+
+  val exampleInput =
+    """#####
+      |.####
+      |.####
+      |.####
+      |.#.#.
+      |.#...
+      |.....
+      |
+      |#####
+      |##.##
+      |.#.##
+      |...##
+      |...#.
+      |...#.
+      |.....
+      |
+      |.....
+      |#....
+      |#....
+      |#...#
+      |#.#.#
+      |#.###
+      |#####
+      |
+      |.....
+      |.....
+      |#.#..
+      |###..
+      |###.#
+      |###.#
+      |#####
+      |
+      |.....
+      |.....
+      |.....
+      |#....
+      |#.#..
+      |#.#.#
+      |#####""".stripMargin
+
+  test("Part 1 examples") {
+    assert(countLockKeyFits(parseLockKeys(exampleInput)) == 3)
+  }
+
+  test("Part 1 input answer") {
+    assert(countLockKeyFits(parseLockKeys(input)) == 3264)
+  }
+}
diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day10Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day10Test.scala
new file mode 100644
index 00000000..2e36de76
--- /dev/null
+++ b/src/test/scala/eu/sim642/adventofcode2025/Day10Test.scala
@@ -0,0 +1,55 @@
+package eu.sim642.adventofcode2025
+
+import Day10.*
+import Day10Test.*
+import org.scalatest.Suites
+import org.scalatest.funsuite.AnyFunSuite
+
+class Day10Test extends Suites(
+  new Part1Test,
+  new NaivePart2SolutionTest,
+  new Z3Part2SolutionTest,
+  new GaussianEliminationPart2SolutionTest,
+)
+
+object Day10Test {
+
+  val exampleInput =
+    """[.##.] (3) (1,3) (2) (2,3) (0,2) (0,1) {3,5,4,7}
+      |[...#.] (0,2,3,4) (2,3) (0,4) (0,1,2) (1,2,3,4) {7,5,12,7,2}
+      |[.###.#] (0,1,2,3,4) (0,3,4) (0,1,2,4,5) (1,2) {10,11,11,5,10,5}""".stripMargin
+
+  class Part1Test extends AnyFunSuite {
+
+    test("Part 1 examples") {
+      assert(Part1.sumFewestPresses(parseMachines(exampleInput)) == 7)
+    }
+
+    test("Part 1 input answer") {
+      assert(Part1.sumFewestPresses(parseMachines(input)) == 449)
+    }
+  }
+
+  abstract class Part2SolutionTest(part2Solution: Part2Solution) extends AnyFunSuite {
+
+    test("Part 2 examples") {
+      assert(part2Solution.sumFewestPresses(parseMachines(exampleInput)) == 33)
+    }
+
+    protected val testInput = true
+
+    if (testInput) {
+      test("Part 2 input answer") {
+        assert(part2Solution.sumFewestPresses(parseMachines(input)) == 17848)
+      }
+    }
+  }
+
+  class NaivePart2SolutionTest extends Part2SolutionTest(NaivePart2Solution) {
+    override protected val testInput: Boolean = false
+  }
+
+  class Z3Part2SolutionTest extends Part2SolutionTest(Z3Part2Solution)
+
+  class GaussianEliminationPart2SolutionTest extends Part2SolutionTest(GaussianEliminationPart2Solution)
+}
diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day11Benchmark.scala b/src/test/scala/eu/sim642/adventofcode2025/Day11Benchmark.scala
new file mode 100644
index 00000000..83a56915
--- /dev/null
+++ b/src/test/scala/eu/sim642/adventofcode2025/Day11Benchmark.scala
@@ -0,0 +1,40 @@
+package eu.sim642.adventofcode2025
+
+import Day11.*
+import org.scalameter.Bench
+import org.scalameter.api.Gen
+
+object Day11Benchmark extends Bench.Group {
+
+  val inputDevices = parseDevices(input)
+
+  abstract class SolutionBenchmark(solution: Solution) extends Bench.LocalTime {
+    performance of solution.getClass.getSimpleName in {
+      performance of "Part 1" in {
+        measure method "countPaths" in {
+          using (Gen.unit("input")) in { _ =>
+            solution.Part1.countPaths(inputDevices)
+          }
+        }
+      }
+
+      performance of "Part 2" in {
+        measure method "countPaths" in {
+          using (Gen.unit("input")) in { _ =>
+            solution.Part2.countPaths(inputDevices)
+          }
+        }
+      }
+    }
+  }
+
+  class ViaMapSolutionBenchmark extends SolutionBenchmark(ViaMapSolution)
+
+  class ViaPairSolutionBenchmark extends SolutionBenchmark(ViaPairSolution)
+
+  class PermutationsSolutionBenchmark extends SolutionBenchmark(PermutationSolution)
+
+  include(new ViaMapSolutionBenchmark)
+  include(new ViaPairSolutionBenchmark)
+  include(new PermutationsSolutionBenchmark)
+}
diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day11Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day11Test.scala
new file mode 100644
index 00000000..d6ee97f6
--- /dev/null
+++ b/src/test/scala/eu/sim642/adventofcode2025/Day11Test.scala
@@ -0,0 +1,66 @@
+package eu.sim642.adventofcode2025
+
+import Day11.*
+import Day11Test.*
+import org.scalatest.Suites
+import org.scalatest.funsuite.AnyFunSuite
+
+class Day11Test extends Suites(
+  new ViaMapSolutionTest,
+  new ViaPairSolutionTest,
+  new PermutationSolutionTest,
+)
+
+object Day11Test {
+
+  val exampleInput =
+    """aaa: you hhh
+      |you: bbb ccc
+      |bbb: ddd eee
+      |ccc: ddd eee fff
+      |ddd: ggg
+      |eee: out
+      |fff: out
+      |ggg: out
+      |hhh: ccc fff iii
+      |iii: out""".stripMargin
+
+  val exampleInput2 =
+    """svr: aaa bbb
+      |aaa: fft
+      |fft: ccc
+      |bbb: tty
+      |tty: ccc
+      |ccc: ddd eee
+      |ddd: hub
+      |hub: fff
+      |eee: dac
+      |dac: fff
+      |fff: ggg hhh
+      |ggg: out
+      |hhh: out""".stripMargin
+
+  abstract class SolutionTest(solution: Solution) extends AnyFunSuite {
+    test("Part 1 examples") {
+      assert(solution.Part1.countPaths(parseDevices(exampleInput)) == 5)
+    }
+
+    test("Part 1 input answer") {
+      assert(solution.Part1.countPaths(parseDevices(input)) == 643)
+    }
+
+    test("Part 2 examples") {
+      assert(solution.Part2.countPaths(parseDevices(exampleInput2)) == 2)
+    }
+
+    test("Part 2 input answer") {
+      assert(solution.Part2.countPaths(parseDevices(input)) == 417190406827152L)
+    }
+  }
+
+  class ViaMapSolutionTest extends SolutionTest(ViaMapSolution)
+
+  class ViaPairSolutionTest extends SolutionTest(ViaPairSolution)
+
+  class PermutationSolutionTest extends SolutionTest(PermutationSolution)
+}
diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day12Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day12Test.scala
new file mode 100644
index 00000000..20038c6f
--- /dev/null
+++ b/src/test/scala/eu/sim642/adventofcode2025/Day12Test.scala
@@ -0,0 +1,55 @@
+package eu.sim642.adventofcode2025
+
+import Day12._
+import org.scalatest.funsuite.AnyFunSuite
+
+class Day12Test extends AnyFunSuite {
+
+  val exampleInput =
+    """0:
+      |###
+      |##.
+      |##.
+      |
+      |1:
+      |###
+      |##.
+      |.##
+      |
+      |2:
+      |.##
+      |###
+      |##.
+      |
+      |3:
+      |##.
+      |###
+      |##.
+      |
+      |4:
+      |###
+      |#..
+      |###
+      |
+      |5:
+      |###
+      |.#.
+      |###
+      |
+      |4x4: 0 0 0 0 2 0
+      |12x5: 1 0 1 0 2 2
+      |12x5: 1 0 1 0 3 2""".stripMargin
+
+  test("Part 1 examples") {
+    import NaiveSolution._ // doesn't work with cheat solution
+    val input1 = parseInput(exampleInput)
+    assert(fits(input1.shapes)(input1.regions(0)))
+    assert(fits(input1.shapes)(input1.regions(1)))
+    assert(!fits(input1.shapes)(input1.regions(2)))
+    assert(countFits(parseInput(exampleInput)) == 2)
+  }
+
+  test("Part 1 input answer") {
+    assert(SanitySolution.countFits(parseInput(input)) == 443)
+  }
+}
diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day1Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day1Test.scala
new file mode 100644
index 00000000..e72a2840
--- /dev/null
+++ b/src/test/scala/eu/sim642/adventofcode2025/Day1Test.scala
@@ -0,0 +1,36 @@
+package eu.sim642.adventofcode2025
+
+import Day1._
+import org.scalatest.funsuite.AnyFunSuite
+
+class Day1Test extends AnyFunSuite {
+
+  val exampleInput =
+    """L68
+      |L30
+      |R48
+      |L5
+      |R60
+      |L55
+      |L1
+      |L99
+      |R14
+      |L82""".stripMargin
+
+  test("Part 1 examples") {
+    assert(Part1.password(parseRotations(exampleInput)) == 3)
+  }
+
+  test("Part 1 input answer") {
+    assert(Part1.password(parseRotations(input)) == 995)
+  }
+
+  test("Part 2 examples") {
+    assert(Part2.password(parseRotations(exampleInput)) == 6)
+    assert(Part2.password(parseRotations("R1000")) == 10)
+  }
+
+  test("Part 2 input answer") {
+    assert(Part2.password(parseRotations(input)) == 5847)
+  }
+}
diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day2Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day2Test.scala
new file mode 100644
index 00000000..b5923d88
--- /dev/null
+++ b/src/test/scala/eu/sim642/adventofcode2025/Day2Test.scala
@@ -0,0 +1,26 @@
+package eu.sim642.adventofcode2025
+
+import Day2._
+import org.scalatest.funsuite.AnyFunSuite
+
+class Day2Test extends AnyFunSuite {
+
+  val exampleInput =
+    """11-22,95-115,998-1012,1188511880-1188511890,222220-222224,1698522-1698528,446443-446449,38593856-38593862,565653-565659,824824821-824824827,2121212118-2121212124"""
+
+  test("Part 1 examples") {
+    assert(Part1.sumInvalidIds(parseRanges(exampleInput)) == 1227775554)
+  }
+
+  test("Part 1 input answer") {
+    assert(Part1.sumInvalidIds(parseRanges(input)) == 5398419778L)
+  }
+
+  test("Part 2 examples") {
+    assert(Part2.sumInvalidIds(parseRanges(exampleInput)) == 4174379265L)
+  }
+
+  test("Part 2 input answer") {
+    assert(Part2.sumInvalidIds(parseRanges(input)) == 15704845910L)
+  }
+}
diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day3Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day3Test.scala
new file mode 100644
index 00000000..c264d154
--- /dev/null
+++ b/src/test/scala/eu/sim642/adventofcode2025/Day3Test.scala
@@ -0,0 +1,32 @@
+package eu.sim642.adventofcode2025
+
+import Day3._
+import org.scalatest.funsuite.AnyFunSuite
+
+class Day3Test extends AnyFunSuite {
+
+  val exampleInput =
+    """987654321111111
+      |811111111111119
+      |234234234234278
+      |818181911112111""".stripMargin
+
+  test("Part 1 examples") {
+    assert(Part1.maxJoltage("98") == 98)
+    assert(Part1.maxJoltage("987") == 98)
+    assert(Part1.totalJoltage(parseBanks(exampleInput)) == 357)
+  }
+
+  test("Part 1 input answer") {
+    assert(Part1.totalJoltage(parseBanks(input)) == 17301)
+  }
+
+  test("Part 2 examples") {
+    assert(Part2.maxJoltage("987654321111111") == 987654321111L)
+    assert(Part2.totalJoltage(parseBanks(exampleInput)) == 3121910778619L)
+  }
+
+  test("Part 2 input answer") {
+    assert(Part2.totalJoltage(parseBanks(input)) == 172162399742349L)
+  }
+}
diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day4Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day4Test.scala
new file mode 100644
index 00000000..bfe56585
--- /dev/null
+++ b/src/test/scala/eu/sim642/adventofcode2025/Day4Test.scala
@@ -0,0 +1,35 @@
+package eu.sim642.adventofcode2025
+
+import Day4._
+import org.scalatest.funsuite.AnyFunSuite
+
+class Day4Test extends AnyFunSuite {
+
+  val exampleInput =
+    """..@@.@@@@.
+      |@@@.@.@.@@
+      |@@@@@.@.@@
+      |@.@@@@..@.
+      |@@.@@@@.@@
+      |.@@@@@@@.@
+      |.@.@.@.@@@
+      |@.@@@.@@@@
+      |.@@@@@@@@.
+      |@.@.@@@.@.""".stripMargin
+
+  test("Part 1 examples") {
+    assert(countAccessibleRolls(parseGrid(exampleInput)) == 13)
+  }
+
+  test("Part 1 input answer") {
+    assert(countAccessibleRolls(parseGrid(input)) == 1527)
+  }
+
+  test("Part 2 examples") {
+    assert(countRemovableRolls(parseGrid(exampleInput)) == 43)
+  }
+
+  test("Part 2 input answer") {
+    assert(countRemovableRolls(parseGrid(input)) == 8690)
+  }
+}
diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day5Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day5Test.scala
new file mode 100644
index 00000000..63192baf
--- /dev/null
+++ b/src/test/scala/eu/sim642/adventofcode2025/Day5Test.scala
@@ -0,0 +1,36 @@
+package eu.sim642.adventofcode2025
+
+import Day5._
+import org.scalatest.funsuite.AnyFunSuite
+
+class Day5Test extends AnyFunSuite {
+
+  val exampleInput =
+    """3-5
+      |10-14
+      |16-20
+      |12-18
+      |
+      |1
+      |5
+      |8
+      |11
+      |17
+      |32""".stripMargin
+
+  test("Part 1 examples") {
+    assert(countFreshAvailable(parseDatabase(exampleInput)) == 3)
+  }
+
+  test("Part 1 input answer") {
+    assert(countFreshAvailable(parseDatabase(input)) == 679)
+  }
+
+  test("Part 2 examples") {
+    assert(countFresh(parseDatabase(exampleInput)) == 14)
+  }
+
+  test("Part 2 input answer") {
+    assert(countFresh(parseDatabase(input)) == 358155203664116L)
+  }
+}
diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day6Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day6Test.scala
new file mode 100644
index 00000000..561f32bc
--- /dev/null
+++ b/src/test/scala/eu/sim642/adventofcode2025/Day6Test.scala
@@ -0,0 +1,29 @@
+package eu.sim642.adventofcode2025
+
+import Day6._
+import org.scalatest.funsuite.AnyFunSuite
+
+class Day6Test extends AnyFunSuite {
+
+  val exampleInput =
+    """123 328  51 64
+      | 45 64  387 23
+      |  6 98  215 314
+      |*   +   *   +""".stripMargin
+
+  test("Part 1 examples") {
+    assert(sumAnswers(Part1.parseProblems(exampleInput)) == 4277556)
+  }
+
+  test("Part 1 input answer") {
+    assert(sumAnswers(Part1.parseProblems(input)) == 5361735137219L)
+  }
+
+  test("Part 2 examples") {
+    assert(sumAnswers(Part2.parseProblems(exampleInput)) == 3263827)
+  }
+
+  test("Part 2 input answer") {
+    assert(sumAnswers(Part2.parseProblems(input)) == 11744693538946L)
+  }
+}
diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day7Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day7Test.scala
new file mode 100644
index 00000000..a2fec4d5
--- /dev/null
+++ b/src/test/scala/eu/sim642/adventofcode2025/Day7Test.scala
@@ -0,0 +1,41 @@
+package eu.sim642.adventofcode2025
+
+import Day7._
+import org.scalatest.funsuite.AnyFunSuite
+
+class Day7Test extends AnyFunSuite {
+
+  val exampleInput =
+    """.......S.......
+      |...............
+      |.......^.......
+      |...............
+      |......^.^......
+      |...............
+      |.....^.^.^.....
+      |...............
+      |....^.^...^....
+      |...............
+      |...^.^...^.^...
+      |...............
+      |..^...^.....^..
+      |...............
+      |.^.^.^.^.^...^.
+      |...............""".stripMargin
+
+  test("Part 1 examples") {
+    assert(countBeamSplits(parseGrid(exampleInput)) == 21)
+  }
+
+  test("Part 1 input answer") {
+    assert(countBeamSplits(parseGrid(input)) == 1587)
+  }
+
+  test("Part 2 examples") {
+    assert(countTimelines(parseGrid(exampleInput)) == 40)
+  }
+
+  test("Part 2 input answer") {
+    assert(countTimelines(parseGrid(input)) == 5748679033029L)
+  }
+}
diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day8Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day8Test.scala
new file mode 100644
index 00000000..0e58baa6
--- /dev/null
+++ b/src/test/scala/eu/sim642/adventofcode2025/Day8Test.scala
@@ -0,0 +1,45 @@
+package eu.sim642.adventofcode2025
+
+import Day8._
+import org.scalatest.funsuite.AnyFunSuite
+
+class Day8Test extends AnyFunSuite {
+
+  val exampleInput =
+    """162,817,812
+      |57,618,57
+      |906,360,560
+      |592,479,940
+      |352,342,300
+      |466,668,158
+      |542,29,236
+      |431,825,988
+      |739,650,466
+      |52,470,668
+      |216,146,977
+      |819,987,18
+      |117,168,530
+      |805,96,715
+      |346,949,466
+      |970,615,88
+      |941,993,340
+      |862,61,35
+      |984,92,344
+      |425,690,689""".stripMargin
+
+  test("Part 1 examples") {
+    assert(multiplySizesAfter(parseJunctionBoxes(exampleInput), after = 10) == 40)
+  }
+
+  test("Part 1 input answer") {
+    assert(multiplySizesAfter(parseJunctionBoxes(input)) == 52668)
+  }
+
+  test("Part 2 examples") {
+    assert(multiplyLastXs(parseJunctionBoxes(exampleInput)) == 25272)
+  }
+
+  test("Part 2 input answer") {
+    assert(multiplyLastXs(parseJunctionBoxes(input)) == 1474050600)
+  }
+}
diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day9Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day9Test.scala
new file mode 100644
index 00000000..b8f5e96f
--- /dev/null
+++ b/src/test/scala/eu/sim642/adventofcode2025/Day9Test.scala
@@ -0,0 +1,96 @@
+package eu.sim642.adventofcode2025
+
+import Day9.*
+import Day9Test.*
+import org.scalatest.Suites
+import org.scalatest.funsuite.AnyFunSuite
+
+class Day9Test extends Suites(
+  new Part1Test,
+  new CompressGridPart2SolutionTest,
+  new IntersectionPart2SolutionTest,
+)
+
+object Day9Test {
+
+  val exampleInput =
+    """7,1
+      |11,1
+      |11,7
+      |9,7
+      |9,5
+      |2,5
+      |2,3
+      |7,3""".stripMargin
+
+  val largeUInput =
+    """1,1
+      |3,1
+      |3,1000
+      |1000,1000
+      |1000,1
+      |1002,1
+      |1002,1002
+      |1,1002""".stripMargin
+
+  val adjacentCoordinateInput = // from Timvde on Libera IRC
+    """1,1
+      |3,1
+      |3,6
+      |4,6
+      |4,1
+      |6,1
+      |6,10
+      |1,10""".stripMargin
+
+  class Part1Test extends AnyFunSuite {
+
+    test("Part 1 examples") {
+      assert(Part1.largestArea(parseRedTiles(exampleInput)) == 50)
+    }
+
+    test("Part 1 large U") {
+      assert(Part1.largestArea(parseRedTiles(largeUInput)) == 1004004)
+    }
+
+    test("Part 1 adjacent coordinate") {
+      assert(Part1.largestArea(parseRedTiles(adjacentCoordinateInput)) == 60)
+    }
+
+    test("Part 1 input answer") {
+      assert(Part1.largestArea(parseRedTiles(input)) == 4729332959L)
+    }
+  }
+
+  abstract class Part2SolutionTest(val part2Solution: Part2Solution) extends AnyFunSuite {
+
+    test("Part 2 examples") {
+      assert(part2Solution.largestArea(parseRedTiles(exampleInput)) == 24)
+    }
+
+    ignore("Part 2 adjacent coordinate") {
+      // should not be 30
+      assert(part2Solution.largestArea(parseRedTiles(adjacentCoordinateInput)) == 60)
+    }
+
+    test("Part 2 input answer") {
+      assert(part2Solution.largestArea(parseRedTiles(input)) == 1474477524L)
+    }
+  }
+
+  class CompressGridPart2SolutionTest extends Part2SolutionTest(CompressGridPart2Solution) {
+
+    test("Part 2 large U") {
+      // should not be 998000, which would be the completely outside box in the large U
+      assert(part2Solution.largestArea(parseRedTiles(largeUInput)) == 3006)
+    }
+  }
+
+  class IntersectionPart2SolutionTest extends Part2SolutionTest(IntersectionPart2Solution) {
+
+    ignore("Part 2 large U") { // fails due to assumption
+      // should not be 998000, which would be the completely outside box in the large U
+      assert(part2Solution.largestArea(parseRedTiles(largeUInput)) == 3006)
+    }
+  }
+}