diff --git a/2023/day10/main.go b/2023/day10/main.go
index 1c4acda..0207b59 100644
--- a/2023/day10/main.go
+++ b/2023/day10/main.go
@@ -44,7 +44,7 @@ func part2(m h.CoordByteMap, loop []h.Coordinate) {
 		for x := m.TLX; x <= m.BRX; x++ {
 			wrk := h.Coordinate{X: x, Y: y}
 			wrkV := m.Get(wrk)
-			if h.CoordListContains(wrk, loop) { //&& (wrkV == NS || wrkV == NE || wrkV == NW) {
+			if h.CoordListContains(wrk, loop) {
 				// This coordinate is part of the loop, so it can change the 'inside' flag
 				// A corner _only_ changes the flag if the 'exiting' corner continues in the same direction
 				// i.e.: L--J doesn't change the flag, L--7 does change the flag
diff --git a/2023/day18/input b/2023/day18/input
new file mode 100644
index 0000000..505fe6d
--- /dev/null
+++ b/2023/day18/input
@@ -0,0 +1,604 @@
+R 2 (#3e6b80)
+U 6 (#2b1de3)
+R 4 (#1465b0)
+U 2 (#549d23)
+R 6 (#aa9992)
+U 6 (#27e7f3)
+R 7 (#aa9990)
+U 6 (#5a3933)
+R 5 (#1465b2)
+U 5 (#23ade3)
+R 4 (#49b5b2)
+U 6 (#39ad53)
+R 7 (#54c4f2)
+U 5 (#491513)
+R 9 (#4f5960)
+U 5 (#357be3)
+R 3 (#4f2140)
+U 6 (#258b43)
+R 4 (#4f9570)
+U 3 (#1ea371)
+R 8 (#7be6c0)
+U 5 (#67bd61)
+R 5 (#a31240)
+U 6 (#6bf7d1)
+R 5 (#a31242)
+U 4 (#3464a1)
+R 3 (#7be6c2)
+U 4 (#33f091)
+R 5 (#5c0530)
+U 6 (#4c4e11)
+R 2 (#611e90)
+U 3 (#128231)
+R 6 (#5ecef2)
+D 9 (#6eb251)
+R 5 (#5e54d2)
+U 9 (#1e8081)
+R 3 (#73a8b0)
+U 10 (#6dc731)
+R 3 (#84d470)
+U 2 (#6b91a1)
+R 7 (#64edf0)
+U 5 (#4da881)
+R 10 (#710072)
+D 5 (#4aa4f1)
+R 7 (#4dd192)
+D 6 (#4aa4f3)
+R 3 (#2af062)
+D 6 (#6fabe1)
+R 5 (#177cc0)
+U 5 (#26ba61)
+R 5 (#5a3aa0)
+U 9 (#3b5401)
+R 5 (#012590)
+U 2 (#747f11)
+R 4 (#753b32)
+U 7 (#965a31)
+R 4 (#753b30)
+U 3 (#20c281)
+R 5 (#225830)
+U 4 (#7a4da1)
+R 4 (#716560)
+U 6 (#036ca1)
+R 5 (#55fd00)
+D 4 (#064ad1)
+R 4 (#93a480)
+D 6 (#411d21)
+R 3 (#990d00)
+D 6 (#4af4a1)
+R 3 (#0f8880)
+D 4 (#0f56c3)
+R 3 (#7f2590)
+U 7 (#0f56c1)
+R 7 (#374e40)
+U 6 (#4af4a3)
+R 2 (#161a20)
+U 3 (#5277d1)
+R 5 (#7c6760)
+U 4 (#528313)
+R 4 (#525840)
+U 4 (#267643)
+L 10 (#525842)
+U 5 (#501273)
+L 4 (#447950)
+D 10 (#69cdc3)
+L 3 (#530a00)
+U 10 (#590643)
+L 5 (#243450)
+D 5 (#74a853)
+L 6 (#7c2a42)
+U 5 (#1d9673)
+L 3 (#3f8d62)
+U 8 (#606b43)
+L 5 (#576480)
+D 8 (#63d243)
+L 5 (#86ad60)
+U 4 (#63d241)
+L 7 (#0be9f0)
+U 8 (#4b0801)
+L 2 (#64f9c0)
+U 4 (#478081)
+R 9 (#20b940)
+U 4 (#a60cd1)
+L 9 (#02c6a0)
+U 5 (#0d8be1)
+L 4 (#8226e0)
+D 6 (#013a81)
+L 3 (#5cf860)
+D 4 (#985951)
+L 5 (#162d72)
+D 2 (#1c2c31)
+L 2 (#654f82)
+D 4 (#51b4e1)
+R 10 (#401a32)
+D 5 (#32c291)
+L 7 (#84ff82)
+D 2 (#25cf41)
+L 3 (#43b090)
+D 4 (#6208d1)
+L 3 (#a428a0)
+U 9 (#6208d3)
+L 3 (#07d9c0)
+U 9 (#6e8a01)
+L 2 (#3ab640)
+U 3 (#187711)
+L 4 (#162d70)
+U 6 (#8e5a81)
+L 6 (#049580)
+D 6 (#a81333)
+L 2 (#342030)
+D 3 (#233073)
+L 7 (#510730)
+D 4 (#15cbf3)
+R 3 (#507520)
+D 5 (#3be881)
+R 6 (#52f2a0)
+D 3 (#a52711)
+L 3 (#0d7680)
+D 5 (#1db6c3)
+L 5 (#5f0450)
+U 5 (#6c6d73)
+L 2 (#47abc0)
+D 5 (#707733)
+L 5 (#771be2)
+D 2 (#151c53)
+L 3 (#413da2)
+D 3 (#768703)
+R 11 (#640b02)
+D 2 (#37b343)
+R 4 (#4ac8d0)
+D 5 (#016421)
+L 2 (#907990)
+D 5 (#016423)
+L 3 (#412220)
+U 5 (#0f5603)
+L 9 (#5e11d0)
+D 5 (#24abb1)
+L 7 (#1ab552)
+U 2 (#06e641)
+L 2 (#9e07e2)
+U 4 (#06e643)
+L 6 (#51f692)
+U 4 (#763581)
+L 8 (#3716a0)
+U 4 (#1360d1)
+R 5 (#567bc0)
+U 2 (#222831)
+R 9 (#7d2160)
+U 6 (#72b991)
+L 6 (#4a6840)
+U 3 (#3ef773)
+L 4 (#626a10)
+U 4 (#4c3d93)
+L 4 (#6fa5e2)
+D 4 (#6e0b33)
+L 4 (#6fa5e0)
+U 3 (#38aaf3)
+L 5 (#223552)
+U 5 (#025c33)
+L 4 (#4205c2)
+D 4 (#49ddd3)
+L 3 (#3aa782)
+D 4 (#028fd3)
+L 5 (#76e842)
+D 3 (#028fd1)
+L 3 (#9bc962)
+U 4 (#6bde73)
+L 9 (#9d6be0)
+U 6 (#2db831)
+L 5 (#1192c0)
+U 3 (#6b5c33)
+L 4 (#152940)
+U 4 (#746923)
+L 5 (#8648a0)
+U 3 (#4cb8d1)
+L 3 (#877170)
+U 5 (#24ca21)
+L 4 (#877172)
+D 3 (#6e4261)
+L 2 (#691310)
+D 6 (#655001)
+R 6 (#7e7740)
+D 3 (#1562b1)
+L 6 (#261a00)
+D 4 (#700e91)
+L 4 (#6ade10)
+U 9 (#4a1251)
+L 3 (#5a7c00)
+U 7 (#5a30e1)
+L 6 (#15a832)
+U 3 (#152e01)
+L 3 (#643622)
+U 5 (#977db1)
+L 7 (#4b7bc2)
+U 2 (#546691)
+L 7 (#8cd5a2)
+U 7 (#5b7a31)
+R 3 (#6c85f2)
+U 6 (#6996a1)
+R 8 (#458692)
+U 3 (#370e51)
+R 6 (#7bc6d2)
+U 4 (#07aa01)
+R 4 (#389dc2)
+U 6 (#3de6d3)
+R 6 (#54ece2)
+U 5 (#625703)
+R 10 (#0e9512)
+D 5 (#1e8793)
+R 3 (#873d92)
+U 4 (#2eb4b3)
+R 5 (#2d3432)
+U 5 (#26b2f1)
+R 2 (#2c8c52)
+U 3 (#2ff4c1)
+R 7 (#0e68f2)
+U 3 (#32b371)
+R 8 (#0e68f0)
+U 4 (#5d6fb1)
+R 3 (#128622)
+U 5 (#06af41)
+R 6 (#a95192)
+U 4 (#274af1)
+R 3 (#3af302)
+U 6 (#50fff3)
+R 6 (#3f9cf2)
+U 2 (#50fff1)
+R 3 (#4734a2)
+U 3 (#1a5051)
+L 12 (#986ce0)
+U 3 (#224b61)
+R 9 (#2d66c0)
+U 4 (#6f2a31)
+R 6 (#0aba80)
+U 7 (#0ecb81)
+R 4 (#606870)
+U 3 (#0ecb83)
+L 3 (#4e78e0)
+U 3 (#4563f1)
+L 11 (#8bed00)
+U 3 (#3298c1)
+L 5 (#5a39d0)
+U 2 (#51d641)
+L 8 (#8e6ee0)
+U 4 (#233851)
+R 4 (#31c7a0)
+U 9 (#728831)
+R 3 (#670cd0)
+U 4 (#1f3621)
+L 7 (#8df230)
+U 4 (#44a361)
+R 7 (#2aed30)
+U 7 (#2a0161)
+R 4 (#1db2c0)
+U 3 (#6387c1)
+R 3 (#1886b0)
+D 3 (#128c21)
+R 3 (#acb330)
+D 3 (#3a9d01)
+L 4 (#3658a0)
+D 6 (#00ec51)
+R 4 (#682712)
+D 6 (#2440e1)
+R 5 (#45f812)
+D 9 (#6298d1)
+R 3 (#778f22)
+U 4 (#6298d3)
+R 2 (#271462)
+U 10 (#0d5ff1)
+L 4 (#6a69e2)
+U 5 (#0d5ff3)
+R 6 (#24b5e2)
+U 3 (#2440e3)
+R 5 (#5f3192)
+U 4 (#41c313)
+R 3 (#236852)
+U 7 (#6e15c1)
+R 8 (#5187b2)
+D 5 (#6e15c3)
+R 2 (#65a3d2)
+D 4 (#41c311)
+R 11 (#3dfa02)
+D 4 (#26ca51)
+R 5 (#4e3912)
+D 6 (#797803)
+R 5 (#2f8ee2)
+U 5 (#2a9b83)
+R 8 (#3d6702)
+D 5 (#4646e3)
+R 3 (#3d6700)
+D 2 (#43a1c3)
+R 4 (#592f22)
+D 3 (#9d61c1)
+R 4 (#1f90f2)
+D 5 (#172261)
+R 7 (#5a7ba2)
+D 8 (#797801)
+R 6 (#4e4ad2)
+D 8 (#28fda1)
+R 5 (#55a862)
+D 4 (#28fda3)
+R 5 (#1665a2)
+D 6 (#3fca41)
+R 9 (#850700)
+D 3 (#43f8f1)
+R 3 (#3cbd90)
+D 6 (#620311)
+R 8 (#70b2b2)
+D 6 (#25cb11)
+R 3 (#336c52)
+D 4 (#8da331)
+R 4 (#336c50)
+D 5 (#0594c1)
+R 3 (#4a2b92)
+U 8 (#31cac1)
+R 5 (#392742)
+D 8 (#233743)
+R 6 (#798b32)
+D 4 (#233741)
+R 6 (#4fcde2)
+D 4 (#1ffd91)
+L 9 (#207ed2)
+U 5 (#9314d1)
+L 9 (#056d22)
+D 5 (#56c131)
+L 9 (#431340)
+D 6 (#94bbb1)
+R 8 (#357120)
+D 2 (#19ca71)
+R 8 (#8bebb0)
+D 6 (#4257c1)
+R 8 (#0c4fc0)
+D 3 (#380131)
+R 3 (#07a260)
+D 3 (#02a841)
+L 11 (#100a10)
+D 2 (#07ad11)
+L 4 (#4a2b90)
+D 3 (#10d091)
+R 6 (#609d22)
+D 2 (#69a281)
+R 9 (#320ed2)
+D 5 (#0782c1)
+R 2 (#67c382)
+D 2 (#19a311)
+R 7 (#14e152)
+D 3 (#4ee351)
+R 5 (#14e150)
+D 8 (#54dae1)
+R 3 (#428ba2)
+D 5 (#0a5431)
+R 3 (#1880e2)
+D 2 (#2fc091)
+R 9 (#440bc0)
+D 6 (#758b11)
+R 6 (#6a54b0)
+D 3 (#31f8d1)
+L 6 (#37e190)
+D 5 (#0c4af1)
+L 4 (#6acc62)
+D 2 (#161df1)
+L 4 (#72f272)
+D 4 (#161df3)
+L 7 (#088332)
+D 4 (#182831)
+L 8 (#82d720)
+D 3 (#371df1)
+L 7 (#7207b0)
+D 6 (#206d61)
+R 4 (#0c1082)
+D 2 (#796721)
+R 6 (#220252)
+D 7 (#2948a1)
+R 7 (#5f2c02)
+U 7 (#137d21)
+R 3 (#0fe252)
+D 2 (#0164d1)
+R 6 (#1ce912)
+D 6 (#4e0983)
+R 2 (#7d7c72)
+D 11 (#598c93)
+R 4 (#581202)
+D 8 (#0ffba3)
+L 4 (#500e32)
+D 2 (#42bcf3)
+R 4 (#31e852)
+D 8 (#2d8913)
+R 4 (#1d67d2)
+D 5 (#5a03c3)
+R 9 (#45c0b0)
+D 4 (#3a1e53)
+L 9 (#687430)
+D 4 (#3a1e51)
+L 4 (#25b1b0)
+D 8 (#613e03)
+L 7 (#4ea210)
+D 8 (#366193)
+L 3 (#4cb7c2)
+D 8 (#452333)
+L 6 (#675322)
+D 6 (#6ae223)
+L 3 (#0d88b2)
+D 2 (#23a4a3)
+L 8 (#60f512)
+D 5 (#568a53)
+L 3 (#0cbd02)
+D 3 (#4bad03)
+L 4 (#588672)
+D 4 (#72dfa3)
+L 2 (#960472)
+D 9 (#394403)
+L 5 (#28bcc2)
+D 6 (#4eb073)
+L 6 (#04e992)
+D 3 (#22c803)
+L 3 (#a76142)
+D 5 (#22c801)
+R 10 (#171512)
+D 3 (#25f2f3)
+R 6 (#581600)
+D 7 (#3d0f33)
+L 8 (#142a40)
+D 4 (#6eb893)
+L 5 (#142a42)
+U 4 (#02a243)
+L 9 (#522a40)
+U 2 (#4d2a01)
+L 4 (#081760)
+D 7 (#17c601)
+R 4 (#081762)
+D 6 (#497a01)
+R 5 (#2fbb50)
+D 3 (#4be663)
+R 4 (#3b3140)
+D 2 (#48f803)
+R 3 (#69ec82)
+U 3 (#80c993)
+R 5 (#3f05f2)
+U 8 (#5d5463)
+R 4 (#50d1c2)
+D 3 (#472973)
+R 3 (#1b68a2)
+D 5 (#5ebab3)
+R 7 (#464fd2)
+D 3 (#64c0a1)
+L 7 (#4062d2)
+D 6 (#8e33b3)
+L 5 (#1c3382)
+D 6 (#8e33b1)
+L 4 (#50b882)
+D 4 (#64c0a3)
+L 2 (#2bcfb2)
+D 7 (#84fc61)
+L 3 (#413452)
+U 10 (#84fc63)
+L 3 (#47ad42)
+U 2 (#03ba03)
+L 3 (#7197b2)
+U 5 (#81aa33)
+L 8 (#5c0552)
+D 5 (#235433)
+L 5 (#4236f2)
+D 5 (#4e9bc3)
+L 5 (#3740a0)
+D 2 (#1e7f23)
+L 10 (#3740a2)
+U 3 (#5f66a3)
+R 4 (#4236f0)
+U 7 (#164f83)
+R 4 (#5d1a30)
+U 3 (#1192e1)
+R 4 (#4c67a0)
+U 5 (#954a91)
+L 8 (#3348c0)
+U 3 (#306c01)
+L 4 (#694200)
+U 8 (#52c163)
+L 3 (#6abee0)
+U 3 (#26c123)
+L 4 (#6abee2)
+U 4 (#4c3413)
+L 9 (#4e8800)
+U 5 (#1192e3)
+L 3 (#2bb700)
+U 4 (#21ceb1)
+L 12 (#4ec360)
+U 3 (#21ceb3)
+L 4 (#32f940)
+U 8 (#5d5f73)
+L 4 (#1dcf10)
+U 9 (#3cf413)
+L 3 (#7cc870)
+U 8 (#5f0953)
+L 4 (#376c70)
+U 6 (#01d623)
+L 5 (#697e50)
+U 5 (#99e693)
+L 5 (#6f63b0)
+U 3 (#576c53)
+R 10 (#7fa030)
+U 3 (#1fd933)
+L 5 (#4eb2d2)
+U 6 (#39a1f3)
+L 4 (#3f0452)
+D 4 (#42ffd3)
+L 3 (#5b9d52)
+U 7 (#25c2d3)
+L 8 (#5ba250)
+D 7 (#40d763)
+L 5 (#5ba252)
+D 3 (#5f2a73)
+L 7 (#477ce2)
+D 3 (#2652d1)
+L 5 (#453770)
+D 5 (#758781)
+L 11 (#453772)
+D 3 (#937381)
+L 2 (#119e62)
+D 5 (#131891)
+R 5 (#3285e2)
+U 3 (#211fd3)
+R 11 (#8349d2)
+U 4 (#211fd1)
+R 4 (#3246c2)
+U 3 (#2515f3)
+R 9 (#5a5bd0)
+D 7 (#6fbf83)
+R 4 (#6a5680)
+D 3 (#6fbf81)
+R 9 (#329240)
+D 7 (#750063)
+R 5 (#5e71f2)
+D 9 (#3358d3)
+L 6 (#1d2652)
+D 4 (#6a8ee3)
+L 3 (#4e9cd2)
+U 6 (#3e8623)
+L 2 (#3607d2)
+U 5 (#379d43)
+L 6 (#3cf342)
+U 3 (#853b63)
+L 3 (#737102)
+D 3 (#1de1b3)
+L 2 (#66ff82)
+D 10 (#634163)
+L 3 (#2eff02)
+U 6 (#2ac343)
+L 2 (#528a42)
+U 7 (#4d81d3)
+L 3 (#2ea1e2)
+D 5 (#19e063)
+L 6 (#8b5a82)
+D 7 (#4b8e33)
+L 4 (#5e41d0)
+D 2 (#159903)
+L 5 (#31f3c0)
+D 9 (#537013)
+L 2 (#31f3c2)
+D 7 (#4b7b43)
+L 4 (#5bd890)
+D 10 (#1be163)
+L 5 (#0c3340)
+D 3 (#540d83)
+L 9 (#2449f0)
+U 6 (#9411c1)
+L 7 (#766db0)
+U 7 (#9411c3)
+L 4 (#37ee30)
+D 3 (#516ad3)
+L 3 (#0991b0)
+D 2 (#98a733)
+L 5 (#0ea042)
+D 3 (#513f83)
+L 2 (#a0c682)
+D 8 (#616323)
+L 4 (#a0c680)
+D 3 (#4555b3)
+L 3 (#79e032)
+U 9 (#673de3)
+L 4 (#5904b0)
+U 7 (#495bd3)
+L 3 (#5904b2)
+U 2 (#49a633)
+L 5 (#76a9c2)
+U 10 (#10de23)
diff --git a/2023/day18/main.go b/2023/day18/main.go
new file mode 100644
index 0000000..9678bc5
--- /dev/null
+++ b/2023/day18/main.go
@@ -0,0 +1,63 @@
+package main
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+
+	h "git.bullercodeworks.com/brian/adventofcode/helpers"
+)
+
+func main() {
+	inp := h.StdinToStringSlice()
+	part1(inp)
+	fmt.Println()
+	part2(inp)
+}
+
+func part1(input []string) {
+	dirMap := map[byte]h.Coordinate{
+		'U': h.Coordinate{X: 0, Y: -1},
+		'R': h.Coordinate{X: 1, Y: 0},
+		'D': h.Coordinate{X: 0, Y: 1},
+		'L': h.Coordinate{X: -1, Y: 0},
+	}
+
+	curr, area := h.Coordinate{X: 0, Y: 0}, 0
+	for i := range input {
+		pts := strings.Fields(input[i])
+		dir, length, _ := pts[0][0], h.Atoi(pts[1]), strings.Trim(pts[1], "()")
+		n := curr.Add(dirMap[dir].Mul(length))
+		area += curr.X*n.Y - curr.Y*n.X + length
+		curr = n
+	}
+	fmt.Println("# Part 1")
+	fmt.Println(area/2 + 1)
+}
+
+func part2(input []string) {
+	dirMap := map[byte]h.Coordinate{
+		'3': h.Coordinate{X: 0, Y: -1},
+		'0': h.Coordinate{X: 1, Y: 0},
+		'1': h.Coordinate{X: 0, Y: 1},
+		'2': h.Coordinate{X: -1, Y: 0},
+	}
+
+	hexToDec := func(hex string) int {
+		v, _ := strconv.ParseInt(hex, 16, strconv.IntSize)
+		return int(v)
+	}
+	curr, area := h.Coordinate{X: 0, Y: 0}, 0
+	for i := range input {
+		pts := strings.Fields(input[i])
+		pts[2] = strings.Trim(pts[2], "#()")
+		length := hexToDec(pts[2][:len(pts[2])-1])
+		dir := pts[2][len(pts[2])-1:][0]
+
+		n := curr.Add(dirMap[dir].Mul(length))
+		area += curr.X*n.Y - curr.Y*n.X + length
+		curr = n
+	}
+	fmt.Println("# Part 2")
+	fmt.Println(area/2 + 1)
+}
diff --git a/2023/day18/problem b/2023/day18/problem
new file mode 100644
index 0000000..fea7686
--- /dev/null
+++ b/2023/day18/problem
@@ -0,0 +1,168 @@
+                               [1]Advent of Code
+
+     • [2][About]
+     • [3][Events]
+     • [4][Shop]
+     • [5][Settings]
+     • [6][Log Out]
+
+   br0xen [7](AoC++) 36*
+
+                                  0xffff&[8]2023
+
+     • [9][Calendar]
+     • [10][AoC++]
+     • [11][Sponsors]
+     • [12][Leaderboard]
+     • [13][Stats]
+
+   Our [14]sponsors help make Advent of Code possible:
+   [15]Best Buy - Our purpose is to enrich lives through technology. Join us!
+
+--- Day 18: Lavaduct Lagoon ---
+
+   Thanks to your efforts, the machine parts factory is one of the first
+   factories up and running since the lavafall came back. However, to catch
+   up with the large backlog of parts requests, the factory will also need a
+   large supply of lava for a while; the Elves have already started creating
+   a large lagoon nearby for this purpose.
+
+   However, they aren't sure the lagoon will be big enough; they've asked you
+   to take a look at the dig plan (your puzzle input). For example:
+
+ R 6 (#70c710)
+ D 5 (#0dc571)
+ L 2 (#5713f0)
+ D 2 (#d2c081)
+ R 2 (#59c680)
+ D 2 (#411b91)
+ L 5 (#8ceee2)
+ U 2 (#caa173)
+ L 1 (#1b58a2)
+ U 2 (#caa171)
+ R 2 (#7807d2)
+ U 3 (#a77fa3)
+ L 2 (#015232)
+ U 2 (#7a21e3)
+
+   The digger starts in a 1 meter cube hole in the ground. They then dig the
+   specified number of meters up (U), down (D), left (L), or right (R),
+   clearing full 1 meter cubes as they go. The directions are given as seen
+   from above, so if "up" were north, then "right" would be east, and so on.
+   Each trench is also listed with the color that the edge of the trench
+   should be painted as an [16]RGB hexadecimal color code.
+
+   When viewed from above, the above example dig plan would result in the
+   following loop of trench (#) having been dug out from otherwise
+   ground-level terrain (.):
+
+ #######
+ #.....#
+ ###...#
+ ..#...#
+ ..#...#
+ ###.###
+ #...#..
+ ##..###
+ .#....#
+ .######
+
+   At this point, the trench could contain 38 cubic meters of lava. However,
+   this is just the edge of the lagoon; the next step is to dig out the
+   interior so that it is one meter deep as well:
+
+ #######
+ #######
+ #######
+ ..#####
+ ..#####
+ #######
+ #####..
+ #######
+ .######
+ .######
+
+   Now, the lagoon can contain a much more respectable 62 cubic meters of
+   lava. While the interior is dug out, the edges are also painted according
+   to the color codes in the dig plan.
+
+   The Elves are concerned the lagoon won't be large enough; if they follow
+   their dig plan, how many cubic meters of lava could it hold?
+
+   Your puzzle answer was 42317.
+
+--- Part Two ---
+
+   The Elves were right to be concerned; the planned lagoon would be much too
+   small.
+
+   After a few minutes, someone realizes what happened; someone swapped the
+   color and instruction parameters when producing the dig plan. They don't
+   have time to fix the bug; one of them asks if you can extract the correct
+   instructions from the hexadecimal codes.
+
+   Each hexadecimal code is six hexadecimal digits long. The first five
+   hexadecimal digits encode the distance in meters as a five-digit
+   hexadecimal number. The last hexadecimal digit encodes the direction to
+   dig: 0 means R, 1 means D, 2 means L, and 3 means U.
+
+   So, in the above example, the hexadecimal codes can be converted into the
+   true instructions:
+
+     • #70c710 = R 461937
+     • #0dc571 = D 56407
+     • #5713f0 = R 356671
+     • #d2c081 = D 863240
+     • #59c680 = R 367720
+     • #411b91 = D 266681
+     • #8ceee2 = L 577262
+     • #caa173 = U 829975
+     • #1b58a2 = L 112010
+     • #caa171 = D 829975
+     • #7807d2 = L 491645
+     • #a77fa3 = U 686074
+     • #015232 = L 5411
+     • #7a21e3 = U 500254
+
+   Digging out this loop and its interior produces a lagoon that can hold an
+   impressive 952408144115 cubic meters of lava.
+
+   Convert the hexadecimal color codes into the correct instructions; if the
+   Elves follow this new dig plan, how many cubic meters of lava could the
+   lagoon hold?
+
+   Your puzzle answer was 83605563360288.
+
+   Both parts of this puzzle are complete! They provide two gold stars: **
+
+   At this point, you should [17]return to your Advent calendar and try
+   another puzzle.
+
+   If you still want to see it, you can [18]get your puzzle input.
+
+   You can also [Shareon [19]Twitter [20]Mastodon] this puzzle.
+
+References
+
+   Visible links
+   1. https://adventofcode.com/
+   2. https://adventofcode.com/2023/about
+   3. https://adventofcode.com/2023/events
+   4. https://teespring.com/stores/advent-of-code
+   5. https://adventofcode.com/2023/settings
+   6. https://adventofcode.com/2023/auth/logout
+   7. Advent of Code Supporter
+	https://adventofcode.com/2023/support
+   8. https://adventofcode.com/2023
+   9. https://adventofcode.com/2023
+  10. https://adventofcode.com/2023/support
+  11. https://adventofcode.com/2023/sponsors
+  12. https://adventofcode.com/2023/leaderboard
+  13. https://adventofcode.com/2023/stats
+  14. https://adventofcode.com/2023/sponsors
+  15. https://jobs.bestbuy.com/bby?id=career_area&content=technology&career_site=Digital%20and%20Technology,Data%20and%20Analytics&spa=1&s=req_id_num
+  16. https://en.wikipedia.org/wiki/RGB_color_model#Numeric_representations
+  17. https://adventofcode.com/2023
+  18. https://adventofcode.com/2023/day/18/input
+  19. https://twitter.com/intent/tweet?text=I%27ve+completed+%22Lavaduct+Lagoon%22+%2D+Day+18+%2D+Advent+of+Code+2023&url=https%3A%2F%2Fadventofcode%2Ecom%2F2023%2Fday%2F18&related=ericwastl&hashtags=AdventOfCode
+  20. javascript:void(0);
diff --git a/2023/day18/testinput b/2023/day18/testinput
new file mode 100644
index 0000000..fc7612e
--- /dev/null
+++ b/2023/day18/testinput
@@ -0,0 +1,14 @@
+R 6 (#70c710)
+D 5 (#0dc571)
+L 2 (#5713f0)
+D 2 (#d2c081)
+R 2 (#59c680)
+D 2 (#411b91)
+L 5 (#8ceee2)
+U 2 (#caa173)
+L 1 (#1b58a2)
+U 2 (#caa171)
+R 2 (#7807d2)
+U 3 (#a77fa3)
+L 2 (#015232)
+U 2 (#7a21e3)
diff --git a/helpers/coordinate.go b/helpers/coordinate.go
index 9d0a8de..01b44c1 100644
--- a/helpers/coordinate.go
+++ b/helpers/coordinate.go
@@ -44,6 +44,12 @@ func (c Coordinate) Add(o Coordinate) Coordinate {
 		Y: c.Y + o.Y,
 	}
 }
+func (c Coordinate) Mul(by int) Coordinate {
+	return Coordinate{
+		X: c.X * by,
+		Y: c.Y * by,
+	}
+}
 
 func (c Coordinate) North() Coordinate {
 	return Coordinate{X: c.X, Y: c.Y - 1}