diff --git a/2021/day22/input b/2021/day22/input
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index 0000000..072c596
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+on x=7191..37647,y=-74506..-52303,z=45114..65447
+off x=53433..79524,y=21402..48649,z=5035..16962
+off x=54924..71855,y=28434..48319,z=-27603..-14643
+off x=44568..73341,y=41377..69060,z=2132..18323
+off x=32192..46654,y=-86893..-59876,z=21008..38923
+off x=-26751..-3856,y=21442..39353,z=-84098..-58106
+off x=63303..65533,y=42998..54340,z=3302..15908
+on x=4235..13687,y=-50180..-34351,z=-76521..-58485
+on x=-33290..-9251,y=40469..57296,z=-66106..-48947
+off x=-81172..-62578,y=6482..36668,z=-45865..-22894
+off x=-81904..-65892,y=-11941..4053,z=-42478..-22147
+off x=35829..70381,y=41448..69602,z=18749..38582
+on x=-10433..-2099,y=-82602..-51316,z=36823..64092
+on x=38080..53913,y=36937..47688,z=39322..71479
+on x=-21560..-4521,y=66563..85082,z=20252..45582
+off x=-85857..-68417,y=-41847..-28573,z=-7729..2847
+on x=-68327..-31793,y=-21900..-289,z=56789..69398
+on x=-67562..-42688,y=16743..32262,z=22000..44570
+off x=48052..67704,y=-23423..4103,z=44261..78217
+on x=-22576..-194,y=61895..82600,z=-40620..-5831
+on x=-16931..7379,y=-15102..1748,z=-87988..-74150
+on x=-26047..12491,y=55107..74563,z=21205..33348
+off x=-25435..-946,y=-82352..-52608,z=33364..53843
+off x=-5833..18798,y=39831..56611,z=-72213..-47388
+off x=-5822..14115,y=-98135..-64976,z=-20248..9788
+on x=-15154..670,y=-75227..-54455,z=33215..60140
+off x=18909..48180,y=62835..69076,z=27175..44519
+off x=-58838..-51811,y=-8942..14922,z=-72422..-48233
+on x=47362..82935,y=-58723..-33218,z=-14356..7150
+on x=-64609..-42063,y=-58790..-35608,z=-50387..-39455
+on x=9832..20482,y=40076..58832,z=41495..59344
+on x=-29810..-7444,y=-73368..-47276,z=-64805..-37263
+on x=-66021..-35774,y=44614..81545,z=-2880..20810
+on x=30417..44347,y=64937..66634,z=27916..47000
+on x=14925..33804,y=-59990..-48743,z=-55335..-46081
+off x=-45330..-16788,y=-2912..25446,z=-78240..-63474
+off x=-75837..-58168,y=-7970..3635,z=30476..60250
+off x=-12011..13258,y=-89694..-69437,z=23137..41026
+on x=58141..91626,y=-3240..13201,z=23976..30297
+off x=-69440..-42294,y=-3341..11023,z=-75797..-55367
+off x=28775..48112,y=49087..66505,z=-47634..-19480
+off x=17405..40878,y=-78515..-63319,z=20589..35237
+on x=46505..79525,y=46254..52587,z=-16956..-979
+off x=14778..49904,y=51599..61793,z=-68550..-48309
+off x=-17127..-2237,y=-80624..-47506,z=-43373..-23646
+on x=42852..55498,y=60931..70121,z=-913..10924
+on x=53866..67942,y=10584..28056,z=44574..51590
+on x=52164..61481,y=25073..45284,z=20579..54644
+off x=-38817..-3710,y=49963..73191,z=35577..68161
+off x=74571..87380,y=-26549..-8365,z=-41849..-15478
+on x=-11635..-3471,y=-2190..2324,z=-84076..-75086
+on x=-87133..-75239,y=-9635..11698,z=-1887..26028
+off x=-65700..-58148,y=-27843..-17147,z=46837..51188
+on x=-8973..19499,y=-57314..-31198,z=-82041..-63223
+on x=-8234..7290,y=72201..85190,z=-41415..-12525
+off x=-69515..-63879,y=-11878..12202,z=-61049..-31131
+on x=-593..25155,y=71211..88034,z=-13360..13827
+off x=-41118..-22761,y=-51023..-43558,z=42131..56647
+on x=45695..64697,y=-70454..-47486,z=4653..27783
+off x=-69391..-49194,y=-6224..21792,z=-56102..-46702
+on x=12567..16989,y=63359..83739,z=-7433..18488
+on x=-47607..-28894,y=-76890..-58285,z=16882..41914
+on x=-30015..4988,y=14737..22104,z=62453..85467
+on x=-54404..-44808,y=-50918..-32444,z=-49452..-43588
+off x=12954..44089,y=-28041..-5913,z=67605..87219
+on x=-82272..-53812,y=25783..42439,z=-42516..-12409
+off x=-94480..-60573,y=-25004..-2471,z=-2718..11057
+off x=51649..65225,y=-14724..6310,z=38450..66205
+off x=69856..80286,y=21304..46173,z=-11935..15518
+on x=-77660..-69829,y=-25072..-3423,z=25500..50923
+off x=37047..59725,y=51835..79489,z=272..35097
+on x=-67713..-31489,y=35835..38541,z=-57246..-47586
+on x=-18556..-7707,y=-17678..-8114,z=-87728..-59085
+off x=-78610..-61520,y=11250..38454,z=-8429..3203
+off x=-44797..-21166,y=-14536..9531,z=59712..82290
+off x=45719..59834,y=-18760..-4920,z=-52363..-46018
+off x=-35717..-12687,y=-83577..-62558,z=-8962..21313
+on x=44536..59941,y=29580..64623,z=-24759..-4916
+off x=-18864..-3108,y=48226..78222,z=42732..67354
+on x=12357..39639,y=-44392..-26900,z=-82899..-54317
+off x=-58310..-24651,y=15307..42877,z=-77149..-40022
+on x=-43945..-20285,y=70712..82950,z=-4121..3442
+off x=7101..22967,y=64872..83707,z=-25824..-9526
+on x=-62076..-43190,y=-21347..-3360,z=-63874..-36231
+off x=6340..27337,y=-73151..-47585,z=46269..52581
+off x=47397..57486,y=-63732..-40590,z=44295..49537
+off x=-78613..-57237,y=-56534..-32459,z=-35285..-13648
+off x=-31072..-7685,y=-38542..-7098,z=57760..83347
+on x=-63099..-35927,y=-77355..-53793,z=29264..33129
+on x=-3649..25126,y=4399..19136,z=-90001..-77851
+off x=8510..11246,y=57072..89213,z=11594..31605
+off x=-16380..3546,y=28043..58308,z=62410..70708
+off x=-73518..-51371,y=8803..36830,z=27148..50003
+off x=-76901..-55804,y=-20544..-14756,z=-34886..-16018
+on x=42245..58590,y=-60103..-37286,z=-38862..-20729
+off x=2872..20494,y=76096..89070,z=-30072..-13378
+off x=62225..70240,y=18398..51759,z=-26426..-10316
+on x=-8268..25701,y=-44287..-22096,z=-73605..-62816
+on x=12693..28817,y=-90968..-58755,z=-38493..-10212
+on x=-72781..-51700,y=-59730..-40159,z=-22471..-10811
+off x=-86186..-61431,y=-40796..-16811,z=-20606..1945
+on x=19756..40482,y=41370..75797,z=22120..46137
+on x=-38689..-13316,y=-24252..-16211,z=66862..80344
+on x=25358..46927,y=-81264..-64854,z=29512..35413
+on x=-16755..18260,y=-75084..-53865,z=48791..62218
+on x=37799..45278,y=38376..53913,z=31553..51525
+on x=-78288..-65705,y=-20882..5515,z=-56620..-32490
+off x=-14779..-3865,y=-35491..-12433,z=60969..77610
+on x=1041..7426,y=-75565..-54588,z=36056..52921
+on x=-41864..-34775,y=22219..51820,z=40842..71780
+off x=-23755..2275,y=51063..64402,z=-67945..-44438
+on x=-93770..-74301,y=-30533..2469,z=-4612..7196
+on x=-59566..-38442,y=-68259..-32849,z=36360..51994
+on x=43187..57027,y=-18906..-8453,z=-77163..-57489
+on x=-29794..-6913,y=28460..55404,z=-79855..-58015
+off x=-57236..-52204,y=-21814..-7565,z=38317..74160
+off x=56146..75194,y=-39180..-18839,z=-56810..-31930
+on x=-66300..-58204,y=-19301..-4228,z=-61589..-39254
+off x=-73278..-68405,y=22614..43899,z=-16199..-10518
+on x=57074..79996,y=-6578..17919,z=33160..54010
+off x=-40719..-2100,y=65789..80371,z=34406..44030
+on x=-44080..-27053,y=2572..27247,z=51202..87551
+on x=-25151..-7880,y=-60771..-53496,z=-55535..-47740
+off x=-14214..11970,y=-4404..16997,z=-90900..-64733
+off x=16310..46047,y=55884..79489,z=-14464..20211
+on x=51594..75047,y=26992..37723,z=-11584..-911
+on x=-45309..-20784,y=44096..70601,z=-52394..-33571
+off x=16870..35569,y=13219..31860,z=69493..87370
+on x=-22983..-16966,y=59778..70013,z=26803..46876
+on x=33076..50573,y=-80935..-61509,z=-30866..-2196
diff --git a/2021/day22/main.go b/2021/day22/main.go
new file mode 100644
index 0000000..ae3fc06
--- /dev/null
+++ b/2021/day22/main.go
@@ -0,0 +1,179 @@
+package main
+
+import (
+	"fmt"
+	"strings"
+
+	h "git.bullercodeworks.com/brian/adventofcode/helpers"
+)
+
+var steps []cuboid
+
+func main() {
+	inp := h.StdinToStringSlice()
+	for i := range inp {
+		pts := strings.Split(inp[i], " ")
+		c := strings.Split(pts[1], ",")
+		steps = append(steps, NewCuboid(
+			pts[0] == "on",
+			c[0][2:],
+			c[1][2:],
+			c[2][2:],
+		))
+	}
+	m := c3dMap{
+		Field: make(map[h.Coordinate3d]bool),
+		blfX:  -50, trbX: 50,
+		blfY: -50, trbY: 50,
+		blfZ: -50, trbZ: 50,
+	}
+	initialize(&m)
+	reboot()
+}
+
+func initialize(m *c3dMap) {
+	fmt.Println("# Part 1")
+	for i := range steps {
+		m.doInitialize(steps[i])
+	}
+	fmt.Printf("After initialization, %d bits are on.\n", m.count(true))
+}
+
+func reboot() {
+	fmt.Println("# Part 2")
+	var cuboids []cuboid
+	var volume int64
+	for _, s1 := range steps {
+		adds := make([]cuboid, 0)
+		if s1.val {
+			adds = append(adds, s1)
+		}
+		for _, s2 := range cuboids {
+			if i := s1.intersect(s2, !s2.val); i.valid() {
+				adds = append(adds, i)
+			}
+		}
+		cuboids = append(cuboids, adds...)
+	}
+	for _, c := range cuboids {
+		if c.val {
+			volume += c.volume()
+		} else {
+			volume -= c.volume()
+		}
+	}
+	fmt.Printf("After reboot, %d bits are on.\n", volume)
+}
+
+type cuboid struct {
+	val    bool
+	x1, x2 int
+	y1, y2 int
+	z1, z2 int
+}
+
+func NewCuboid(val bool, x, y, z string) cuboid {
+	s := cuboid{val: val}
+	fmt.Sscanf(x, "%d..%d", &s.x1, &s.x2)
+	fmt.Sscanf(y, "%d..%d", &s.y1, &s.y2)
+	fmt.Sscanf(z, "%d..%d", &s.z1, &s.z2)
+	return s
+}
+
+func (s cuboid) volume() int64 {
+	return int64((h.Abs(s.x2-s.x1) + 1) * (h.Abs(s.y2-s.y1) + 1) * (h.Abs(s.z2-s.z1) + 1))
+}
+func (s cuboid) valid() bool {
+	return s.x1 <= s.x2 && s.y1 <= s.y2 && s.z1 <= s.z2
+}
+func (s cuboid) intersect(t cuboid, val bool) cuboid {
+	return cuboid{
+		val: val,
+		x1:  h.Max(s.x1, t.x1),
+		x2:  h.Min(s.x2, t.x2),
+		y1:  h.Max(s.y1, t.y1),
+		y2:  h.Min(s.y2, t.y2),
+		z1:  h.Max(s.z1, t.z1),
+		z2:  h.Min(s.z2, t.z2),
+	}
+}
+func (s cuboid) String() string {
+	return fmt.Sprintf("{%v; x:%d..%d, y:%d..%d, z:%d..%d}", s.val, s.x1, s.x2, s.y1, s.y2, s.z1, s.z2)
+}
+
+// Ended up not even using this for part 2
+type c3dMap struct {
+	Field      map[h.Coordinate3d]bool
+	blfX, trbX int
+	blfY, trbY int
+	blfZ, trbZ int
+}
+
+func (c *c3dMap) count(v bool) int {
+	var ret int
+	for x := c.blfX; x <= c.trbX; x++ {
+		for y := c.blfY; y <= c.trbY; y++ {
+			for z := c.blfZ; z <= c.trbZ; z++ {
+				if c.Field[h.Coordinate3d{X: x, Y: y, Z: z}] == v {
+					ret++
+				}
+			}
+		}
+	}
+	return ret
+}
+
+func (c *c3dMap) doInitialize(s cuboid) {
+	if !c.inRange(s) {
+		return
+	}
+	c.do(s)
+}
+
+func (c *c3dMap) do(s cuboid) {
+	for x := s.x1; x <= s.x2; x++ {
+		if x < c.blfX || x > c.trbX {
+			continue
+		}
+		for y := s.y1; y <= s.y2; y++ {
+			if y < c.blfY || x > c.trbY {
+				continue
+			}
+			for z := s.z1; z <= s.z2; z++ {
+				if z < c.blfZ || x > c.trbZ {
+					continue
+				}
+				c.Field[h.Coordinate3d{X: x, Y: y, Z: z}] = s.val
+			}
+		}
+	}
+}
+
+func (c *c3dMap) inRange(s cuboid) bool {
+	if s.x2 < c.blfX {
+		return false
+	}
+	if s.x1 > c.trbX {
+		return false
+	}
+	if s.y2 < c.blfY {
+		return false
+	}
+	if s.y1 > c.trbY {
+		return false
+	}
+	if s.z2 < c.blfZ {
+		return false
+	}
+	if s.z1 > c.trbZ {
+		return false
+	}
+	return true
+}
+
+func (c c3dMap) Meta() string {
+	return fmt.Sprintf(
+		"{x: %d..%d, y: %d..%d, z: %d..%d}",
+		c.blfX, c.trbX, c.blfY, c.trbY, c.blfZ, c.trbZ,
+	)
+}
diff --git a/2021/day22/testinput b/2021/day22/testinput
new file mode 100644
index 0000000..25975df
--- /dev/null
+++ b/2021/day22/testinput
@@ -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
diff --git a/2021/day22/testinput2 b/2021/day22/testinput2
new file mode 100644
index 0000000..e665295
--- /dev/null
+++ b/2021/day22/testinput2
@@ -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
diff --git a/2021/day22/testinput3 b/2021/day22/testinput3
new file mode 100644
index 0000000..aba7585
--- /dev/null
+++ b/2021/day22/testinput3
@@ -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
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