diff --git a/2023/day18/.gitignore b/2023/day18/.gitignore
new file mode 100644
index 0000000..2a7f9d1
--- /dev/null
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new file mode 100644
index 0000000..5bdd842
--- /dev/null
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new file mode 100644
index 0000000..9123055
--- /dev/null
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new file mode 100644
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+D 7 (#3a3a73)
+R 6 (#665160)
+U 7 (#455c13)
+R 5 (#665162)
+D 7 (#49b5c3)
+R 6 (#4c7ec2)
+D 7 (#20dbe3)
+R 3 (#4f70f2)
+D 5 (#200423)
+R 6 (#1c9b50)
+D 4 (#4c8e73)
+L 7 (#527ca0)
+D 6 (#50c431)
+L 4 (#315e70)
+D 4 (#38f6f3)
+R 4 (#3a9d50)
+D 4 (#4b32f3)
+R 7 (#3a9d52)
+D 3 (#12f343)
+R 3 (#227d30)
+D 5 (#059223)
+R 7 (#2a6c80)
+D 2 (#214061)
+R 4 (#139500)
+D 7 (#4d03f1)
+R 6 (#139502)
+D 3 (#2e6af1)
+R 2 (#49c970)
+D 7 (#50c433)
+R 2 (#15b340)
+D 6 (#75d6e3)
+R 5 (#60ebb2)
+U 4 (#2194b3)
+R 4 (#4296f2)
+U 7 (#7c7eb3)
+L 4 (#384b02)
+U 10 (#11cb73)
+R 4 (#277422)
+U 9 (#07e211)
+R 6 (#144802)
+D 8 (#7d0121)
+R 4 (#144800)
+D 4 (#0966f1)
+R 10 (#15ca42)
+D 4 (#572933)
+L 5 (#1d58f2)
+D 2 (#261ce3)
+L 2 (#1677d2)
+D 8 (#293a23)
+R 7 (#346822)
+D 3 (#49b713)
+R 11 (#32b9b0)
+D 5 (#2ee333)
+L 6 (#32b9b2)
+D 8 (#3fbd03)
+L 5 (#520bc2)
+U 8 (#2c6361)
+L 3 (#002b52)
+D 4 (#452a71)
+L 3 (#802ea2)
+D 4 (#452a73)
+L 5 (#309202)
+D 6 (#47aba1)
+L 5 (#108062)
+D 3 (#4b1803)
+L 3 (#86d332)
+D 4 (#164e93)
+L 5 (#18e3b2)
+U 5 (#3d4a63)
+L 9 (#31cb32)
+U 2 (#163ec1)
+L 6 (#1ed2c2)
+U 7 (#86a751)
+L 3 (#1ed2c0)
+D 4 (#01cae1)
+L 3 (#1d6ea2)
+D 5 (#328e01)
+L 5 (#56a3a2)
+D 5 (#2f9b81)
+L 3 (#279cf2)
+D 4 (#44bae1)
+L 11 (#108122)
+D 3 (#4e7291)
+R 11 (#22ba70)
+D 5 (#61fdc3)
+L 4 (#5fb660)
+D 7 (#092193)
+R 7 (#3a4e40)
+U 4 (#303033)
+R 6 (#099990)
+U 9 (#4b4ea1)
+R 4 (#323870)
+D 3 (#3ee241)
+R 2 (#1f18e0)
+D 10 (#111ea1)
+R 6 (#11d2a0)
+D 8 (#3b1833)
+L 4 (#45fc10)
+U 4 (#5ae0c3)
+L 8 (#2a4810)
+D 8 (#0df533)
+L 6 (#3c1730)
+U 8 (#0bd5f1)
+L 4 (#1bcf30)
+D 4 (#364c11)
+L 3 (#8a08a0)
+D 5 (#4cddf1)
+L 4 (#8a08a2)
+D 5 (#14ee31)
+R 4 (#2da520)
+D 4 (#134281)
+L 3 (#1fd280)
+D 4 (#4b7501)
+L 3 (#348f32)
+D 10 (#5a47f1)
+L 3 (#1a1042)
+D 3 (#305e31)
+L 4 (#3f3df2)
+D 6 (#4248b1)
+L 8 (#7f62a2)
+D 2 (#316c01)
+L 3 (#5e6472)
+D 3 (#03dab1)
+L 3 (#603612)
+D 3 (#03dab3)
+L 11 (#272482)
+D 5 (#016b63)
+L 8 (#0be902)
+D 5 (#0d4c63)
+R 11 (#4e58b2)
+D 6 (#81d8e3)
+R 3 (#480df2)
+D 4 (#0d08f3)
+L 6 (#0d4632)
+U 7 (#835683)
+L 3 (#0f8ec2)
+D 7 (#18fe83)
+L 5 (#30fb10)
+D 3 (#3d63e3)
+R 8 (#30fb12)
+D 3 (#386af3)
+L 5 (#35f182)
+D 5 (#6a03f3)
+L 3 (#4f0732)
+U 5 (#137183)
+L 4 (#71b2d2)
+U 3 (#2fd0f3)
+L 6 (#721082)
+U 2 (#02e3f3)
+L 8 (#670070)
+U 5 (#3186f3)
+R 6 (#628c20)
+U 2 (#0dc693)
+R 8 (#677d10)
+U 6 (#0dc691)
+L 3 (#1249b0)
+U 8 (#3186f1)
+L 5 (#34f770)
+D 5 (#43aa93)
+L 3 (#700862)
+U 3 (#22e603)
+L 7 (#0573a2)
+U 9 (#554633)
+L 4 (#463472)
+U 5 (#096c93)
+R 9 (#27db92)
+U 3 (#7b9ed3)
+R 4 (#4e9670)
+U 4 (#3899a3)
+L 8 (#4e9672)
+U 8 (#7b3683)
+L 5 (#3ebc32)
+U 5 (#39c403)
+L 5 (#4aca20)
+D 7 (#378803)
+L 3 (#796400)
+D 3 (#1f5f33)
+L 6 (#2850c0)
+D 3 (#7cc673)
+L 6 (#07ac50)
+D 5 (#853a91)
+L 2 (#162f10)
+D 7 (#0309b1)
+L 5 (#534730)
+D 4 (#2f1b81)
+L 3 (#30f2f0)
+D 6 (#214cc1)
+L 7 (#0eedb0)
+D 2 (#46e153)
+L 9 (#12cf10)
+U 5 (#354783)
+L 3 (#5e79a0)
+U 6 (#330193)
+L 5 (#59aa10)
+D 11 (#618491)
+L 6 (#1ce360)
+D 7 (#4da5d1)
+L 5 (#728550)
+U 4 (#2b1fe1)
+L 5 (#037270)
+U 3 (#510281)
+L 11 (#0a91a0)
+U 4 (#252b03)
+R 6 (#3b4430)
+U 4 (#7edd33)
+R 10 (#350530)
+U 3 (#7edd31)
+L 4 (#1c4fc0)
+U 8 (#315b03)
+L 5 (#106ae0)
+U 10 (#3970f3)
+L 7 (#077d82)
+U 2 (#242323)
+L 5 (#7e2d02)
+U 10 (#00c0b3)
+L 4 (#175982)
+D 4 (#00aa53)
+L 3 (#03a892)
+D 8 (#2bc153)
+L 3 (#5d8b92)
+D 11 (#707e03)
+L 5 (#613420)
+U 6 (#030a83)
+L 4 (#4425a0)
+U 7 (#3fc6d1)
+L 7 (#1638b2)
+U 5 (#55f951)
+R 11 (#1638b0)
+U 3 (#066581)
+L 8 (#26a7f0)
+U 2 (#5cbaa3)
+L 4 (#4defe0)
+U 8 (#366f63)
+L 4 (#6f17f0)
+U 3 (#3b5e43)
+L 6 (#1d99f0)
+U 5 (#40e183)
+L 5 (#8c2162)
+D 8 (#4458b3)
+L 3 (#31c512)
+U 10 (#009c73)
diff --git a/2023/day18/src/main.rs b/2023/day18/src/main.rs
new file mode 100644
index 0000000..bd4ec0a
--- /dev/null
+++ b/2023/day18/src/main.rs
@@ -0,0 +1,166 @@
+// Problem: https://adventofcode.com/2023/day/18
+
+use std::collections::HashSet;
+
+use itertools::Itertools;
+use sscanf::sscanf;
+
+type Result = usize;
+type Point = (i64, i64);
+
+#[derive(Debug, PartialEq, Eq, Hash, PartialOrd, Ord)]
+enum Dir {
+    Up,
+    Down,
+    Right,
+    Left,
+}
+impl Dir {
+    fn mv(&self, (r, c): Point) -> Point {
+        match self {
+            Up => (r - 1, c),
+            Down => (r + 1, c),
+            Right => (r, c + 1),
+            Left => (r, c - 1),
+        }
+    }
+}
+use Dir::*;
+
+type Instruction = (Dir, i64, String);
+
+type Input = Vec<Instruction>;
+
+fn parse_input(input: &str) -> Input {
+    input
+        .trim()
+        .lines()
+        .map(|line| {
+            let (ch, amount, color) = sscanf!(line, "{char} {i64} (#{String})").unwrap();
+            (
+                match ch {
+                    'R' => Right,
+                    'D' => Down,
+                    'L' => Left,
+                    'U' => Up,
+                    _ => panic!(),
+                },
+                amount,
+                color,
+            )
+        })
+        .collect()
+}
+
+// ------------------------------------------
+
+fn full_surface(map: &HashSet<Point>) -> usize {
+    let (min_r, max_r) = match map.iter().map(|(r, _)| r).minmax() {
+        itertools::MinMaxResult::NoElements => panic!(),
+        itertools::MinMaxResult::OneElement(v) => (*v, *v),
+        itertools::MinMaxResult::MinMax(min, max) => (*min, *max),
+    };
+    let (min_c, max_c) = match map.iter().map(|(_, c)| c).minmax() {
+        itertools::MinMaxResult::NoElements => panic!(),
+        itertools::MinMaxResult::OneElement(v) => (*v, *v),
+        itertools::MinMaxResult::MinMax(min, max) => (*min, *max),
+    };
+    let mut fill_map = HashSet::new();
+    let mut queue = vec![(min_r - 1, min_c - 1)];
+    let lines = &((min_r - 1)..=(max_r + 1));
+    let cols = &((min_c - 1)..=(max_c + 1));
+    while let Some(point) = queue.pop() {
+        for dir in [Up, Down, Left, Right] {
+            let next = dir.mv(point);
+            if lines.contains(&next.0)
+                && cols.contains(&next.1)
+                && !map.contains(&next)
+                && !fill_map.contains(&next)
+            {
+                fill_map.insert(next);
+                queue.push(next);
+            }
+        }
+    }
+    let mut surface = 0;
+    for r in (min_r)..=(max_r) {
+        for c in (min_c)..=(max_c) {
+            if !fill_map.contains(&(r, c)) {
+                surface += 1;
+            }
+        }
+    }
+    surface
+}
+
+fn part1(input: &Input) -> Result {
+    let mut cur = (0, 0);
+    let mut map: HashSet<Point> = HashSet::new();
+    map.insert(cur);
+    for (dir, amount, _) in input {
+        for _ in 0..(*amount as usize) {
+            cur = dir.mv(cur);
+            map.insert(cur);
+        }
+    }
+
+    full_surface(&map)
+}
+
+#[test]
+fn test_part1() {
+    let input = parse_input(include_str!("test.txt"));
+    dbg!(&input);
+    assert_eq!(part1(&input), 62);
+}
+
+// ------------------------------------------
+
+fn decode(color: &str) -> (i32, Dir) {
+    (
+        i32::from_str_radix(&color[0..5], 16).unwrap(),
+        match &color[5..6] {
+            "0" => Right,
+            "1" => Down,
+            "2" => Left,
+            "3" => Up,
+            _ => panic!(),
+        },
+    )
+}
+
+fn showlace(map: &Vec<Point>) -> i64 {
+    let mut area: i64 = 0;
+    for ((r1, c1), (r2, c2)) in map.iter().tuple_windows() {
+        area += r1 * c2 - r2 * c1;
+    }
+    map.len() as i64 + area.abs() / 2 - map.len() as i64 / 2
+}
+
+fn part2(input: &Input) -> Result {
+    let mut cur = (0, 0);
+    let mut map = vec![];
+    map.push(cur);
+    for (_, _, color) in input {
+        let (amount, dir) = decode(color);
+        for _ in 0..(amount as usize) {
+            cur = dir.mv(cur);
+            map.push(cur);
+        }
+    }
+    showlace(&map) as usize
+}
+
+#[test]
+fn test_part2() {
+    let input = parse_input(include_str!("test.txt"));
+    assert_eq!(part2(&input), 952408144115);
+}
+
+// ------------------------------------------
+
+fn main() {
+    let input = parse_input(include_str!("input.txt"));
+    println!("Part 1: {:?}", part1(&input));
+    println!("Part 2: {:?}", part2(&input));
+}
diff --git a/2023/day18/src/test.txt b/2023/day18/src/test.txt
new file mode 100644
index 0000000..fc7612e
--- /dev/null
+++ b/2023/day18/src/test.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)