diff --git a/src/year2021/day22/Day22.kt b/src/year2021/day22/Day22.kt
new file mode 100644
index 0000000..1744c47
--- /dev/null
+++ b/src/year2021/day22/Day22.kt
@@ -0,0 +1,94 @@
+package year2021.day22
+
+import readInput
+
+// region global extensions
+fun IntRange.intersect(other: IntRange): IntRange = maxOf(first, other.first)..minOf(last, other.last)
+// endregion global extensions
+
+// region State
+enum class State {
+    On, Off
+}
+
+fun String.toState(): State = when (this) {
+    "on" -> State.On
+    "off" -> State.Off
+    else -> error("Invalid state given")
+}
+// endregion State
+
+// region Point
+data class Point(val x: Int, val y: Int, val z: Int) {
+    fun within(xRange: IntRange, yRange: IntRange, zRange: IntRange): Boolean =
+        x in xRange && y in yRange && z in zRange
+}
+// endregion Point
+
+// region Cube
+data class Cube(val xRange: IntRange, val yRange: IntRange, val zRange: IntRange) {
+    val allPoints: Iterable<Point>
+        get() = xRange.flatMap { x -> yRange.flatMap { y -> zRange.map { z -> Point(x, y, z) } } }
+
+    fun intersect(other: Cube): Cube = Cube(
+        xRange = xRange.intersect(other.xRange),
+        yRange = yRange.intersect(other.yRange),
+        zRange = zRange.intersect(other.zRange),
+    )
+}
+// endregion Cube
+
+// region Step
+data class Step(val state: State, val cube: Cube) {
+    val allPoints: Iterable<Point>
+        get() = cube.allPoints
+
+    fun crop(cube: Cube): Step = this.copy(cube = this.cube.intersect(cube))
+}
+
+fun String.toStep(): Step {
+    val (state, regions) = this.split(" ")
+
+    val (xRange, yRange, zRange) =
+        regions.split(",")
+            .map { it.split("=")[1].split("..").map(String::toInt) }
+            .map { it[0]..it[1] }
+
+    return Step(state.toState(), Cube(xRange, yRange, zRange))
+}
+// endregion Step
+
+fun part1(input: List<Step>): Int = input.fold(mutableSetOf<Point>()) { turnedOn, step ->
+    val croppedStep = step.crop(Cube(-50..50, -50..50, -50..50))
+    when (step.state) {
+        State.On -> turnedOn.addAll(croppedStep.allPoints)
+        State.Off -> turnedOn.removeAll(croppedStep.allPoints)
+    }
+
+    turnedOn
+}.size
+
+fun part2(input: List<Step>): Long = input.fold(mutableSetOf<Triple<Int, Int, Int>>()) { turnedOn, step ->
+    when (step.state) {
+        State.On -> turnedOn.addAll(step.allPoints.map { Triple(it.x, it.y, it.z) })
+        State.Off -> turnedOn.removeAll(step.allPoints.map { Triple(it.x, it.y, it.z) })
+    }
+
+    turnedOn
+}.size.toLong()
+
+fun main() {
+    val smallerSample = readInput(22, "smaller_sample").map(String::toStep)
+    val sample = readInput(22, "sample").map(String::toStep)
+    val input = readInput(22, "input").map(String::toStep)
+
+    check(part1(smallerSample) == 39)
+    check(part1(sample) == 590784)
+    println(part1(input))
+
+    val rebootSample = readInput(22, "reboot_sample").map(String::toStep)
+
+    check(part2(rebootSample) == 2758514936282235L)
+    println(part2(input))
+}
+
diff --git a/src/year2021/day22/reboot_sample.txt b/src/year2021/day22/reboot_sample.txt
new file mode 100644
index 0000000..2790bed
--- /dev/null
+++ b/src/year2021/day22/reboot_sample.txt
@@ -0,0 +1,60 @@
+on x=-5..47,y=-31..22,z=-19..33
+on x=-44..5,y=-27..21,z=-14..35
+on x=-49..-1,y=-11..42,z=-10..38
+on x=-20..34,y=-40..6,z=-44..1
+off x=26..39,y=40..50,z=-2..11
+on x=-41..5,y=-41..6,z=-36..8
+off x=-43..-33,y=-45..-28,z=7..25
+on x=-33..15,y=-32..19,z=-34..11
+off x=35..47,y=-46..-34,z=-11..5
+on x=-14..36,y=-6..44,z=-16..29
+on x=-57795..-6158,y=29564..72030,z=20435..90618
+on x=36731..105352,y=-21140..28532,z=16094..90401
+on x=30999..107136,y=-53464..15513,z=8553..71215
+on x=13528..83982,y=-99403..-27377,z=-24141..23996
+on x=-72682..-12347,y=18159..111354,z=7391..80950
+on x=-1060..80757,y=-65301..-20884,z=-103788..-16709
+on x=-83015..-9461,y=-72160..-8347,z=-81239..-26856
+on x=-52752..22273,y=-49450..9096,z=54442..119054
+on x=-29982..40483,y=-108474..-28371,z=-24328..38471
+on x=-4958..62750,y=40422..118853,z=-7672..65583
+on x=55694..108686,y=-43367..46958,z=-26781..48729
+on x=-98497..-18186,y=-63569..3412,z=1232..88485
+on x=-726..56291,y=-62629..13224,z=18033..85226
+on x=-110886..-34664,y=-81338..-8658,z=8914..63723
+on x=-55829..24974,y=-16897..54165,z=-121762..-28058
+on x=-65152..-11147,y=22489..91432,z=-58782..1780
+on x=-120100..-32970,y=-46592..27473,z=-11695..61039
+on x=-18631..37533,y=-124565..-50804,z=-35667..28308
+on x=-57817..18248,y=49321..117703,z=5745..55881
+on x=14781..98692,y=-1341..70827,z=15753..70151
+on x=-34419..55919,y=-19626..40991,z=39015..114138
+on x=-60785..11593,y=-56135..2999,z=-95368..-26915
+on x=-32178..58085,y=17647..101866,z=-91405..-8878
+on x=-53655..12091,y=50097..105568,z=-75335..-4862
+on x=-111166..-40997,y=-71714..2688,z=5609..50954
+on x=-16602..70118,y=-98693..-44401,z=5197..76897
+on x=16383..101554,y=4615..83635,z=-44907..18747
+off x=-95822..-15171,y=-19987..48940,z=10804..104439
+on x=-89813..-14614,y=16069..88491,z=-3297..45228
+on x=41075..99376,y=-20427..49978,z=-52012..13762
+on x=-21330..50085,y=-17944..62733,z=-112280..-30197
+on x=-16478..35915,y=36008..118594,z=-7885..47086
+off x=-98156..-27851,y=-49952..43171,z=-99005..-8456
+off x=2032..69770,y=-71013..4824,z=7471..94418
+on x=43670..120875,y=-42068..12382,z=-24787..38892
+off x=37514..111226,y=-45862..25743,z=-16714..54663
+off x=25699..97951,y=-30668..59918,z=-15349..69697
+off x=-44271..17935,y=-9516..60759,z=49131..112598
+on x=-61695..-5813,y=40978..94975,z=8655..80240
+off x=-101086..-9439,y=-7088..67543,z=33935..83858
+off x=18020..114017,y=-48931..32606,z=21474..89843
+off x=-77139..10506,y=-89994..-18797,z=-80..59318
+off x=8476..79288,y=-75520..11602,z=-96624..-24783
+on x=-47488..-1262,y=24338..100707,z=16292..72967
+off x=-84341..13987,y=2429..92914,z=-90671..-1318
+off x=-37810..49457,y=-71013..-7894,z=-105357..-13188
+off x=-27365..46395,y=31009..98017,z=15428..76570
+off x=-70369..-16548,y=22648..78696,z=-1892..86821
+on x=-53470..21291,y=-120233..-33476,z=-44150..38147
+off x=-93533..-4276,y=-16170..68771,z=-104985..-24507
\ No newline at end of file
diff --git a/src/year2021/day22/sample.txt b/src/year2021/day22/sample.txt
new file mode 100644
index 0000000..8c68bc7
--- /dev/null
+++ b/src/year2021/day22/sample.txt
@@ -0,0 +1,22 @@
+on x=-20..26,y=-36..17,z=-47..7
+on x=-20..33,y=-21..23,z=-26..28
+on x=-22..28,y=-29..23,z=-38..16
+on x=-46..7,y=-6..46,z=-50..-1
+on x=-49..1,y=-3..46,z=-24..28
+on x=2..47,y=-22..22,z=-23..27
+on x=-27..23,y=-28..26,z=-21..29
+on x=-39..5,y=-6..47,z=-3..44
+on x=-30..21,y=-8..43,z=-13..34
+on x=-22..26,y=-27..20,z=-29..19
+off x=-48..-32,y=26..41,z=-47..-37
+on x=-12..35,y=6..50,z=-50..-2
+off x=-48..-32,y=-32..-16,z=-15..-5
+on x=-18..26,y=-33..15,z=-7..46
+off x=-40..-22,y=-38..-28,z=23..41
+on x=-16..35,y=-41..10,z=-47..6
+off x=-32..-23,y=11..30,z=-14..3
+on x=-49..-5,y=-3..45,z=-29..18
+off x=18..30,y=-20..-8,z=-3..13
+on x=-41..9,y=-7..43,z=-33..15
+on x=-54112..-39298,y=-85059..-49293,z=-27449..7877
+on x=967..23432,y=45373..81175,z=27513..53682
\ No newline at end of file
diff --git a/src/year2021/day22/smaller_sample.txt b/src/year2021/day22/smaller_sample.txt
new file mode 100644
index 0000000..4d036d6
--- /dev/null
+++ b/src/year2021/day22/smaller_sample.txt
@@ -0,0 +1,4 @@
+on x=10..12,y=10..12,z=10..12
+on x=11..13,y=11..13,z=11..13
+off x=9..11,y=9..11,z=9..11
+on x=10..10,y=10..10,z=10..10
\ No newline at end of file