diff --git a/README.md b/README.md
index 4114aae..4e14d39 100644
--- a/README.md
+++ b/README.md
@@ -28,7 +28,7 @@
 |     2021 |   ★   |   ★   |   ★   |   ★   |   ★   |   ★   |   ★   |   ★   |   ★   |   ★    |   ★    |        |   ★    |   ★    |        |        |        |        |        |        |        |        |        |        |        |    26 |
 |     2022 |   ★   |   ★   |   ★   |   ★   |   ★   |   ★   |   ★   |   ★   |   ★   |   ★    |   ★    |   ★    |   ★    |        |        |        |        |        |        |        |   ☆    |        |        |        |   ☆    |    28 |
 |     2023 |   ★   |   ★   |   ★   |   ★   |   ☆   |   ★   |   ☆   |       |       |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |    12 |
-|     2024 |   ★   |   ★   |   ★   |   ★   |   ★   |   ★   |   ★   |       |       |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |    14 |
+|     2024 |   ★   |   ★   |   ★   |   ★   |   ★   |   ★   |   ★   |   ☆   |       |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |    15 |
 
 ## 🛷 How to run
 
@@ -171,6 +171,7 @@ e.g. `HandyHaversacks`)*
 |                                           |   5 | [Print Queue](https://adventofcode.com/2024/day/5)                                                     | [[Code](src/main/kotlin/adventofcode/year2024/Day05PrintQueue.kt)] [[Test](src/test/kotlin/adventofcode/year2024/Day05PrintQueueSpec.kt)]                                               | `6498`                 | `5017`                                           |
 |                                           |   6 | [Guard Gallivant](https://adventofcode.com/2024/day/6)                                                 | [[Code](src/main/kotlin/adventofcode/year2024/Day06GuardGallivant.kt)] [[Test](src/test/kotlin/adventofcode/year2024/Day06GuardGallivantSpec.kt)]                                       | `5212`                 | `1767`                                           |
 |                                           |   7 | [Bridge Repair](https://adventofcode.com/2024/day/7)                                                   | [[Code](src/main/kotlin/adventofcode/year2024/Day07BridgeRepair.kt)] [[Test](src/test/kotlin/adventofcode/year2024/Day07BridgeRepairSpec.kt)]                                           | `8401132154762`        | `95297119227552`                                 |
+|                                           |   8 | [Resonant Collinearity](https://adventofcode.com/2024/day/8)                                           | [[Code](src/main/kotlin/adventofcode/year2024/Day08ResonantCollinearity.kt)] [[Test](src/test/kotlin/adventofcode/year2024/Day08ResonantCollinearitySpec.kt)]                           | `252`                  |                                                  |
 
 ## 🕯️ Useful commands
 
diff --git a/src/main/kotlin/adventofcode/year2024/Day08ResonantCollinearity.kt b/src/main/kotlin/adventofcode/year2024/Day08ResonantCollinearity.kt
new file mode 100644
index 0000000..d96bab1
--- /dev/null
+++ b/src/main/kotlin/adventofcode/year2024/Day08ResonantCollinearity.kt
@@ -0,0 +1,35 @@
+package adventofcode.year2024
+
+import adventofcode.Puzzle
+import adventofcode.PuzzleInput
+import adventofcode.common.Tuple.minus
+import adventofcode.common.Tuple.plus
+
+class Day08ResonantCollinearity(customInput: PuzzleInput? = null) : Puzzle(customInput) {
+    private val gridSize by lazy { input.lines().size }
+
+    override fun partOne() =
+        input
+            .lines()
+            .flatMapIndexed { y, row -> row.mapIndexed { x, char -> (x to y) to char } }
+            .filterNot { (_, char) -> char == '.' }
+            .groupBy({ it.second }, { it.first })
+            .map { (char, antennas) ->
+                char to antennas.flatMap { a -> antennas.mapNotNull { b -> if (a != b) setOf(a, b) else null } }.toSet()
+            }
+            .map { (char, antennaPairs) ->
+                char to
+                    antennaPairs.map { pair ->
+                        val distance = pair.last() - pair.first()
+                        setOf(pair.first() - distance, pair.last() + distance).filter { it.isInBounds((gridSize)) }
+                    }
+            }
+            .map { (_, antinodes) -> antinodes.flatten() }
+            .reduce { allAntinodes, antinodes -> allAntinodes + antinodes }
+            .toSet()
+            .size
+
+    companion object {
+        fun Pair<Int, Int>.isInBounds(gridSize: Int) = toList().all { it in 0 until gridSize }
+    }
+}
diff --git a/src/main/resources/inputs/year2024/day08.txt b/src/main/resources/inputs/year2024/day08.txt
new file mode 100644
index 0000000..dbf737a
--- /dev/null
+++ b/src/main/resources/inputs/year2024/day08.txt
@@ -0,0 +1,50 @@
+.............4....O..........w....R...............
+.................................f................
+..............4...j......NW0......................
+....................R..W..........................
+...............R..................................
+..................................................
+v.......................f.......0W................
+.....9L............l...N.........w................
+....L....9.......ON........8......................
+.1.........49L........f..0..N.....................
+..........................V...l...................
+..........4.......................................
+.....................j...................3.....U..
+....O.....U.......................................
+........J......................l..................
+.O....s.Q.......j.....l.....w..........F...q......
+..................................................
+.U.......................j..8.....................
+................U...............................3.
+2.............................J............3......
+..............................F...................
+.....s...R...........J..................F.........
+.s......................x..........F.....q........
+.......2.....Q........3........x..................
+...........v......................u...............
+..............v...........n......8............q...
+.......f..................8........i..............
+.5..................1n..............P.....i.......
+............7............Q..................X.....
+......5...p....................V..................
+.................J..........nx............q.......
+.......p............W...........................0.
+......2.............p.5.....1....P................
+......I.................7.X....i...P..............
+............s.....r...w................V..........
+...............or...6.................V...........
+............................PS.7..................
+..........o...........................S...........
+...........5..............o..1.......n............
+...........I.........r.......7.......6............
+.................o.r...........X..................
+................................x.........u.......
+.........p..Q....2................................
+.........v.................S.....................u
+I...........................S.....6...............
+..................................................
+.......I..........................................
+..................................................
+.......................................6..........
+.................................X................
\ No newline at end of file
diff --git a/src/test/kotlin/adventofcode/year2024/Day08ResonantCollinearitySpec.kt b/src/test/kotlin/adventofcode/year2024/Day08ResonantCollinearitySpec.kt
new file mode 100644
index 0000000..707686b
--- /dev/null
+++ b/src/test/kotlin/adventofcode/year2024/Day08ResonantCollinearitySpec.kt
@@ -0,0 +1,5 @@
+package adventofcode.year2024
+
+import adventofcode.PuzzleBaseSpec
+
+class Day08ResonantCollinearitySpec : PuzzleBaseSpec(14)
diff --git a/src/test/resources/inputs/year2024/day08.txt b/src/test/resources/inputs/year2024/day08.txt
new file mode 100644
index 0000000..de0f909
--- /dev/null
+++ b/src/test/resources/inputs/year2024/day08.txt
@@ -0,0 +1,12 @@
+............
+........0...
+.....0......
+.......0....
+....0.......
+......A.....
+............
+............
+........A...
+.........A..
+............
+............
\ No newline at end of file