diff --git a/day18/example.txt b/day18/example.txt
new file mode 100644
index 0000000..0ad754b
--- /dev/null
+++ b/day18/example.txt
@@ -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)
\ No newline at end of file
diff --git a/day18/input.txt b/day18/input.txt
new file mode 100644
index 0000000..79212d7
--- /dev/null
+++ b/day18/input.txt
@@ -0,0 +1,766 @@
+R 4 (#0a7a60)
+U 8 (#4453b3)
+R 6 (#8e4f70)
+U 2 (#4453b1)
+R 4 (#0feb00)
+U 4 (#355591)
+R 8 (#2a09c0)
+U 4 (#544c71)
+R 4 (#472930)
+U 2 (#199e33)
+R 3 (#3d8df0)
+U 5 (#199e31)
+R 7 (#45de50)
+U 4 (#57a941)
+L 7 (#671c70)
+U 5 (#5e5e81)
+R 4 (#2e9b60)
+U 8 (#490881)
+L 7 (#1846f0)
+U 3 (#304101)
+L 4 (#1846f2)
+D 2 (#58f3f1)
+L 9 (#2e9b62)
+D 2 (#56dcd1)
+L 2 (#671c72)
+D 9 (#275fd1)
+L 4 (#76b7b2)
+U 9 (#5b9641)
+L 4 (#1d3212)
+U 10 (#3d1841)
+L 3 (#5ad5e2)
+D 6 (#010211)
+L 5 (#13ec52)
+D 8 (#166471)
+L 3 (#53ebc0)
+D 5 (#0fdba1)
+L 4 (#54e450)
+D 9 (#440a21)
+L 3 (#49b242)
+D 5 (#2f0171)
+L 6 (#447332)
+D 4 (#182561)
+L 8 (#1aaaa2)
+D 6 (#0996a1)
+L 4 (#1c1212)
+D 6 (#5780d1)
+L 7 (#0fc1d2)
+D 7 (#36cb41)
+L 3 (#505552)
+D 7 (#8d8b81)
+R 4 (#2bf742)
+D 7 (#152791)
+R 5 (#760492)
+D 3 (#11a991)
+R 3 (#5debc0)
+D 10 (#59f211)
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+D 8 (#1fc6b1)
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+U 2 (#317053)
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+U 2 (#166713)
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+U 6 (#166711)
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+D 3 (#1d95f1)
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+D 2 (#254e91)
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+D 5 (#53b553)
+R 10 (#513590)
+D 3 (#293c83)
+L 10 (#58e2e0)
+D 4 (#54dd21)
+L 5 (#1bcdf2)
+D 5 (#4b0b71)
+L 5 (#1bcdf0)
+U 6 (#43b811)
+L 5 (#4df1d0)
+U 6 (#36d6a3)
+R 5 (#3bfb20)
+U 5 (#75de61)
+L 5 (#1e0ec2)
+U 4 (#30b571)
+L 7 (#2dfd20)
+D 5 (#49ad61)
+L 2 (#2dfd22)
+D 11 (#715d41)
+L 3 (#1e0ec0)
+U 4 (#0f2091)
+L 4 (#9d29c0)
+U 9 (#475a73)
+L 2 (#108610)
+U 3 (#1e5423)
+L 8 (#394192)
+U 3 (#0274b3)
diff --git a/day18/main.go b/day18/main.go
new file mode 100644
index 0000000..063e3c5
--- /dev/null
+++ b/day18/main.go
@@ -0,0 +1,215 @@
+package main
+
+import (
+	"bufio"
+	_ "embed"
+	"encoding/hex"
+	"fmt"
+	"strings"
+
+	aoc "go.sour.is/advent-of-code"
+)
+
+// var log = aoc.Log
+
+func main() { aoc.MustResult(aoc.Runner(run)) }
+
+type result struct {
+	valuePT1 int
+	valuePT2 int
+}
+
+func (r result) String() string { return fmt.Sprintf("%#v", r) }
+
+func run(scan *bufio.Scanner) (*result, error) {
+
+	var vecs []vec
+
+	for scan.Scan() {
+		text := scan.Text()
+
+		if len(text) == 0 {
+			continue
+		}
+
+		var s string
+		v := vec{}
+		s, text, _ = strings.Cut(text, " ")
+		v.Direction = direction(s)
+		s, text, _ = strings.Cut(text, " ")
+		v.Steps = aoc.Atoi(s)
+		_, text, _ = strings.Cut(text, "#")
+		s, _, _ = strings.Cut(text, ")")
+		b, _ := hex.DecodeString(s)
+		copy(v.Color[:], b)
+		vecs = append(vecs, v)
+	}
+
+	var points []point
+
+	var x, y int
+	var minX, minY int
+	for i, v := range vecs {
+		fmt.Println("pt ", i, v)
+
+		for i := 0; i < v.Steps; i++ {
+			switch v.Direction {
+			case "U":
+				y++
+			case "D":
+				y--
+			case "R":
+				x++
+			case "L":
+				x--
+			}
+
+			minX = min(minX, x)
+			minY = min(minY, y)
+			points = append(points, point{d: v.Direction, x: x, y: y, color: v.Color})
+		}
+	}
+
+	adjX := aoc.ABS(min(0, minX))
+	adjY := aoc.ABS(min(0, minY))
+	fmt.Println("minX", minX, "minY", minY)
+	fmt.Println("adjX", adjX, "adjY", adjY)
+
+	trace := make(map[int]map[int]point)
+
+	minX, minY = 0, 0
+	maxX, maxY := 0, 0
+
+	for i, p := range points {
+		// fmt.Println("raw", i, p)
+		p.x += adjX
+		p.y += adjY
+
+		maxX = max(maxX, p.x)
+		maxY = max(maxY, p.y)
+
+		points[i] = p
+
+		if row, ok := trace[p.y]; true {
+			if !ok {
+				row = make(map[int]point)
+			}
+			row[p.x] = p
+			trace[p.y] = row
+		}
+	}
+
+	area := 0
+
+	for y := 0; y <= maxY; y++ {
+		row, ok := trace[y]
+		if !ok {
+			continue
+		}
+
+		var last direction
+		p, inLoop := row[0]
+		last = p.d
+
+		for x := 0; x <= maxX; x++ {
+			if p, ok := row[x]; ok {
+				switch last+p.d {
+				case " U"," L", "UR":
+					inLoop = true
+				case "LD", " D", "RD":
+					inLoop = !inLoop
+				}
+				if last != p.d {
+					last = p.d
+				}
+				fmt.Print(p.d)
+				if inLoop {
+					area++
+				}
+				continue
+			}
+			last = direction(" ")
+
+			if inLoop {
+				area++
+				fmt.Print(".")
+			} else {
+				fmt.Print(" ")
+			}
+
+		}
+		fmt.Println("")
+	}
+
+	// for y := 0; y < len(trace); y++ {
+	// 	rng := trace[y]
+	// 	sort.Ints(rng)
+	// 	for _, r := range ranges(rng) {
+	// 		area += r[1] - r[0] + 1
+	// 	}
+	// }
+
+	return &result{valuePT1: area}, nil
+}
+
+type direction string
+
+const (
+	U direction = "U"
+	D direction = "D"
+	L direction = "L"
+	R direction = "R"
+)
+
+type vec struct {
+	Direction direction
+	Steps     int
+	Color     [3]byte
+}
+
+type point struct {
+	w     direction
+	d     direction
+	x, y  int
+	color [3]byte
+}
+
+func ranges(rng []int) [][]int {
+	// inLoop := true
+	var mn int = rng[0]
+	var last int = rng[0]
+	var result [][]int
+	result = append(result, []int{mn, mn})
+
+	for _, i := range rng[1:] {
+		if i-last == 1 {
+			result[len(result)-1][1] = i
+			last = i
+			continue
+		}
+
+		last = i
+		mn = i
+		result = append(result, []int{mn, last})
+	}
+
+	if len(result) == 1 {
+		return result
+	}
+
+	if len(result) == 2 {
+		return [][]int{{result[0][0], result[1][1]}}
+	}
+
+	if len(result)%2 == 0 {
+		var result2 [][]int
+		for i := 0; i < len(result); i += 2 {
+			result2 = append(result2, []int{result[i][0], result[i+1][1]})
+		}
+
+		return result2
+	}
+
+	fmt.Println("odd ranges", result)
+	return nil
+}
diff --git a/day18/main_test.go b/day18/main_test.go
new file mode 100644
index 0000000..e709ab5
--- /dev/null
+++ b/day18/main_test.go
@@ -0,0 +1,42 @@
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"testing"
+
+	_ "embed"
+
+	"github.com/matryer/is"
+)
+
+//go:embed example.txt
+var example []byte
+
+//go:embed input.txt
+var input []byte
+
+func TestExample(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(example))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result)
+	is.Equal(result.valuePT1, 62)
+	is.Equal(result.valuePT2, 0)
+}
+
+func TestSolution(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(input))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result)
+	is.True(result.valuePT1 < 68834) // first attempt too high.
+	is.Equal(result.valuePT1, 0)
+	is.Equal(result.valuePT2, 0)
+}