diff --git a/2021/day22_reactor_reboot/Cargo.toml b/2021/day22_reactor_reboot/Cargo.toml
new file mode 100644
index 0000000..4262e43
--- /dev/null
+++ b/2021/day22_reactor_reboot/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "day22_reactor_reboot"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/2021/day22_reactor_reboot/challenge.txt b/2021/day22_reactor_reboot/challenge.txt
new file mode 100644
index 0000000..a91f038
--- /dev/null
+++ b/2021/day22_reactor_reboot/challenge.txt
@@ -0,0 +1,201 @@
+Operating at these extreme ocean depths has overloaded the submarine's reactor; it needs to be rebooted.
+
+The reactor core is made up of a large 3-dimensional grid made up entirely of cubes, one cube per integer 3-dimensional coordinate (`x,y,z`). Each cube can be either *on* or *off*; at the start of the reboot process, they are all *off*. (Could it be an old model of a reactor you've seen [before](/2020/day/17)?)
+
+To reboot the reactor, you just need to set all of the cubes to either *on* or *off* by following a list of *reboot steps* (your puzzle input). Each step specifies a [cuboid](https://en.wikipedia.org/wiki/Cuboid) (the set of all cubes that have coordinates which fall within ranges for `x`, `y`, and `z`) and whether to turn all of the cubes in that cuboid *on* or *off*.
+
+For example, given these reboot steps:
+
+```
+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
+
+```
+
+The first step (`on x=10..12,y=10..12,z=10..12`) turns *on* a 3x3x3 cuboid consisting of 27 cubes:
+
+* `10,10,10`
+* `10,10,11`
+* `10,10,12`
+* `10,11,10`
+* `10,11,11`
+* `10,11,12`
+* `10,12,10`
+* `10,12,11`
+* `10,12,12`
+* `11,10,10`
+* `11,10,11`
+* `11,10,12`
+* `11,11,10`
+* `11,11,11`
+* `11,11,12`
+* `11,12,10`
+* `11,12,11`
+* `11,12,12`
+* `12,10,10`
+* `12,10,11`
+* `12,10,12`
+* `12,11,10`
+* `12,11,11`
+* `12,11,12`
+* `12,12,10`
+* `12,12,11`
+* `12,12,12`
+
+The second step (`on x=11..13,y=11..13,z=11..13`) turns *on* a 3x3x3 cuboid that overlaps with the first. As a result, only 19 additional cubes turn on; the rest are already on from the previous step:
+
+* `11,11,13`
+* `11,12,13`
+* `11,13,11`
+* `11,13,12`
+* `11,13,13`
+* `12,11,13`
+* `12,12,13`
+* `12,13,11`
+* `12,13,12`
+* `12,13,13`
+* `13,11,11`
+* `13,11,12`
+* `13,11,13`
+* `13,12,11`
+* `13,12,12`
+* `13,12,13`
+* `13,13,11`
+* `13,13,12`
+* `13,13,13`
+
+The third step (`off x=9..11,y=9..11,z=9..11`) turns *off* a 3x3x3 cuboid that overlaps partially with some cubes that are on, ultimately turning off 8 cubes:
+
+* `10,10,10`
+* `10,10,11`
+* `10,11,10`
+* `10,11,11`
+* `11,10,10`
+* `11,10,11`
+* `11,11,10`
+* `11,11,11`
+
+The final step (`on x=10..10,y=10..10,z=10..10`) turns *on* a single cube, `10,10,10`. After this last step, `*39*` cubes are *on*.
+
+The initialization procedure only uses cubes that have `x`, `y`, and `z` positions of at least `-50` and at most `50`. For now, ignore cubes outside this region.
+
+Here is a larger example:
+
+```
+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
+
+```
+
+The last two steps are fully outside the initialization procedure area; all other steps are fully within it. After executing these steps in the initialization procedure region, `*590784*` cubes are *on*.
+
+Execute the reboot steps. Afterward, considering only cubes in the region `x=-50..50,y=-50..50,z=-50..50`, *how many cubes are on?*
+
+Your puzzle answer was `588200`.
+
+\--- Part Two ---
+----------
+
+Now that the initialization procedure is complete, you can reboot the reactor.
+
+Starting with all cubes *off*, run all of the *reboot steps* for all cubes in the reactor.
+
+Consider the following reboot steps:
+
+```
+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
+
+```
+
+After running the above reboot steps, `*2758514936282235*` cubes are *on*. (Just for fun, `474140` of those are also in the initialization procedure region.)
+
+Starting again with all cubes *off*, execute all reboot steps. Afterward, considering all cubes, *how many cubes are on?*
+
+Your puzzle answer was `1207167990362099`.
+
+Both parts of this puzzle are complete! They provide two gold stars: \*\*
+
+At this point, you should [return to your Advent calendar](/2021) and try another puzzle.
+
+If you still want to see it, you can [get your puzzle input](22/input).
\ No newline at end of file
diff --git a/2021/day22_reactor_reboot/src/lib.rs b/2021/day22_reactor_reboot/src/lib.rs
new file mode 100644
index 0000000..72647b2
--- /dev/null
+++ b/2021/day22_reactor_reboot/src/lib.rs
@@ -0,0 +1,174 @@
+use core::fmt::Display;
+use std::{num::ParseIntError, collections::HashSet};
+
+#[derive(Debug, PartialEq, Eq)]
+pub enum ParseError {
+    InvalidToggle(String),
+    LineMalformed(String),
+    ParseIntError(std::num::ParseIntError),
+}
+
+impl From<ParseIntError> for ParseError {
+    fn from(value: ParseIntError) -> Self {
+        Self::ParseIntError(value)
+    }
+}
+
+impl Display for ParseError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Self::InvalidToggle(v) => write!(f, "Invalid Toggle Instruction: {v}"),
+            Self::LineMalformed(v) => write!(f, "Line is malformed: {v}"),
+            Self::ParseIntError(e) => write!(f, "Unable to parse into integer: {e}"),
+        }
+    }
+}
+
+#[derive(PartialEq, Eq)]
+enum Toggle {
+    On,
+    Off,
+}
+
+impl TryFrom<&str> for Toggle {
+    type Error = ParseError;
+
+    fn try_from(value: &str) -> Result<Self, Self::Error> {
+        match value {
+            "on" => Ok(Self::On),
+            "off" => Ok(Self::Off),
+            o => Err(Self::Error::InvalidToggle(o.to_string())),
+        }
+    }
+}
+
+impl Toggle {
+    fn target_state(&self) -> bool {
+        match self {
+            Self::On => true,
+            Self::Off => false,
+        }
+    }
+}
+
+struct Instruction {
+    toggle: Toggle,
+    x_range: (isize, isize),
+    y_range: (isize, isize),
+    z_range: (isize, isize),
+}
+
+impl TryFrom<&str> for Instruction {
+    type Error = ParseError;
+
+    fn try_from(value: &str) -> Result<Self, Self::Error> {
+        if let Some((toggle, rest)) = value.split_once(' ') {
+            let toggle = Toggle::try_from(toggle)?;
+
+            let parameters: Vec<_> = rest.split(&['=', ',', '.']).collect();
+            if parameters.len() != 12 {
+                return Err(Self::Error::LineMalformed(value.to_string()));
+            }
+            Ok(Self { 
+                toggle,
+                x_range: (parameters[1].parse()?, parameters[3].parse()?), 
+                y_range: (parameters[5].parse()?, parameters[7].parse()?), 
+                z_range: (parameters[9].parse()?, parameters[11].parse()?) 
+            })
+        } else {
+            Err(Self::Error::LineMalformed(value.to_string()))
+        }
+    }
+}
+
+impl Instruction {
+    fn perform_bounded(&self, target: &mut HashSet<(isize, isize, isize)>, lower_bound: isize, upper_bound: isize) {
+        if self.x_range.0 < upper_bound && self.x_range.1 > lower_bound &&
+            self.y_range.0 < upper_bound && self.y_range.1 > lower_bound &&
+            self.z_range.0 < upper_bound && self.z_range.1 > lower_bound {
+                if self.toggle.target_state() {
+                    (self.x_range.0.max(lower_bound)..=self.x_range.1.min(upper_bound)).for_each(|x| 
+                        (self.y_range.0.max(lower_bound)..=self.y_range.1.min(upper_bound)).for_each(|y| 
+                            (self.z_range.0.max(lower_bound)..=self.z_range.1.min(upper_bound)).for_each(|z| {
+                                target.insert((x, y, z));
+                            })));
+                } else {
+                    (self.x_range.0.max(lower_bound)..=self.x_range.1.min(upper_bound)).for_each(|x| 
+                        (self.y_range.0.max(lower_bound)..=self.y_range.1.min(upper_bound)).for_each(|y| 
+                            (self.z_range.0.max(lower_bound)..=self.z_range.1.min(upper_bound)).for_each(|z| {
+                                target.remove(&(x, y, z));
+                            })));
+                }
+            }
+    }
+
+    fn volume(&self) -> isize {
+        (self.x_range.1 - self.x_range.0 + 1) * (self.y_range.1 - self.y_range.0 + 1) * (self.z_range.1 - self.z_range.0 + 1)
+    }
+
+    fn intersection(&self, rhs: &Self) -> Self {
+        let x_min = self.x_range.0.max(rhs.x_range.0);
+        let y_min = self.y_range.0.max(rhs.y_range.0);
+        let z_min = self.z_range.0.max(rhs.z_range.0);
+        let x_max = self.x_range.1.min(rhs.x_range.1);
+        let y_max = self.y_range.1.min(rhs.y_range.1);
+        let z_max = self.z_range.1.min(rhs.z_range.1);
+        if x_min <= x_max && y_min <= y_max && z_min <= z_max {
+            Self {
+                toggle: Toggle::On,
+                x_range: (x_min, x_max),
+                y_range: (y_min, y_max),
+                z_range: (z_min, z_max),
+            }
+        } else {
+            Self {
+                toggle: Toggle::Off,
+                x_range: (0, -1),
+                y_range: (0, -1),
+                z_range: (0, -1),
+            }
+        }
+    }
+}
+
+pub fn run(input: &str) -> Result<(usize, isize), ParseError> {
+    let instructions: Vec<_> = input.lines().map(Instruction::try_from).collect::<Result<Vec<_>, _>>()?;
+    let mut reactor = HashSet::new();
+    instructions.iter().for_each(|i| i.perform_bounded(&mut reactor, -50, 50));
+    let first = reactor.len();
+    let second = count_cubes(&instructions);
+    Ok((first, second))
+}
+
+fn count_cubes(instructions: &[Instruction]) -> isize {
+    if instructions.is_empty() {
+        0
+    } else if instructions[0].toggle == Toggle::Off {
+        count_cubes(&instructions[1..])
+    } else {
+        let current = &instructions[0];
+        current.volume() + count_cubes(&instructions[1..]) - count_cubes(&instructions.iter().skip(1).map(|other| current.intersection(other)).collect::<Vec<_>>())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::fs::read_to_string;
+
+    fn read_file(name: &str) -> String {
+        read_to_string(name).expect(&format!("Unable to read file: {name}")[..]).trim().to_string()
+    }
+
+    #[test]
+    fn test_sample() {
+        let sample_input = read_file("tests/sample_input");
+        assert_eq!(run(&sample_input), Ok((474140, 2758514936282235)));
+    }
+
+    #[test]
+    fn test_challenge() {
+        let challenge_input = read_file("tests/challenge_input");
+        assert_eq!(run(&challenge_input), Ok((588200, 1207167990362099)));
+    }
+}
diff --git a/2021/day22_reactor_reboot/tests/challenge_input b/2021/day22_reactor_reboot/tests/challenge_input
new file mode 100644
index 0000000..021d3a9
--- /dev/null
+++ b/2021/day22_reactor_reboot/tests/challenge_input
@@ -0,0 +1,420 @@
+on x=-6..41,y=-12..39,z=-10..42
+on x=-33..13,y=-34..15,z=3..47
+on x=-6..47,y=-7..38,z=-23..28
+on x=-10..37,y=-3..43,z=-11..38
+on x=-42..7,y=-39..9,z=-29..22
+on x=-11..37,y=-36..11,z=-34..12
+on x=-31..13,y=-12..40,z=1..49
+on x=-23..28,y=-7..44,z=-39..12
+on x=-1..44,y=-48..3,z=-37..14
+on x=0..49,y=-27..26,z=-33..12
+off x=-13..0,y=35..45,z=6..15
+on x=-41..6,y=-17..32,z=-22..29
+off x=-25..-12,y=-44..-32,z=-19..0
+on x=-31..21,y=-6..47,z=-2..45
+off x=1..17,y=-13..-2,z=-48..-34
+on x=-40..13,y=-4..48,z=-29..17
+off x=17..29,y=-39..-30,z=-15..4
+on x=-20..24,y=-18..27,z=-39..7
+off x=7..20,y=-26..-12,z=-26..-8
+on x=-37..8,y=-17..30,z=-14..38
+on x=63674..72237,y=20683..37531,z=-35064..-16872
+on x=-51990..-35385,y=-78503..-48525,z=-752..35650
+on x=27632..33313,y=35477..62597,z=-58213..-50913
+on x=65890..74495,y=-45869..-13775,z=-39225..-14722
+on x=-275..16102,y=-72595..-60586,z=-53397..-23273
+on x=-69158..-42553,y=45370..61812,z=-42421..-18663
+on x=-78654..-58419,y=-30915..7322,z=-51094..-33929
+on x=-1256..22317,y=37707..59544,z=-63046..-53164
+on x=26513..44666,y=-55290..-34887,z=-62641..-49964
+on x=-38394..-32826,y=20123..52430,z=-74302..-53761
+on x=-76260..-48290,y=-35301..-11819,z=-36430..-22459
+on x=54855..74218,y=-45492..-25796,z=5423..34586
+on x=-60859..-42702,y=37095..58797,z=-42035..-17299
+on x=25061..44950,y=-11087..4566,z=-76090..-58040
+on x=-7719..1196,y=-84740..-56268,z=18595..40418
+on x=37771..58776,y=34417..62574,z=-47992..-23102
+on x=-21356..1356,y=-63790..-54279,z=32547..55070
+on x=-8345..19180,y=-53204..-27521,z=-68280..-61850
+on x=67534..81624,y=-31159..-14948,z=1049..12579
+on x=55346..68022,y=7885..30928,z=-44155..-34352
+on x=36305..74237,y=41145..52234,z=-42601..-28496
+on x=-90070..-73989,y=-23814..-9394,z=14042..31716
+on x=-84427..-54677,y=8904..30283,z=-1322..33502
+on x=-71181..-41802,y=30646..57075,z=35746..53147
+on x=38541..52970,y=-20791..-7785,z=51108..80150
+on x=59180..82388,y=-3853..32838,z=-24341..-5768
+on x=-56690..-39206,y=8232..29724,z=40440..64896
+on x=21608..43080,y=60567..71466,z=40486..52408
+on x=60372..77998,y=-28305..3238,z=14836..37414
+on x=-4093..35198,y=10164..32918,z=-85387..-73526
+on x=-43292..-12636,y=-9696..12766,z=64552..80970
+on x=-28102..1261,y=-70258..-57055,z=-47806..-31344
+on x=-63701..-56970,y=-47663..-38224,z=34022..46913
+on x=-38997..-7735,y=-20643..-11524,z=-76648..-69429
+on x=-511..8645,y=42010..62268,z=-58666..-40526
+on x=16306..47865,y=-64952..-45421,z=53087..54589
+on x=-16279..2136,y=-61390..-44811,z=50710..64292
+on x=-7745..20078,y=386..12000,z=68727..90088
+on x=64690..73403,y=-24946..-7208,z=-37627..-17433
+on x=-90968..-67687,y=17270..37677,z=-13992..-2525
+on x=18861..37721,y=-86406..-68095,z=-23372..-3258
+on x=41065..48438,y=54874..73195,z=-283..27298
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