diff --git a/day18.py b/day18.py
new file mode 100644
index 0000000..5b62e3b
--- /dev/null
+++ b/day18.py
@@ -0,0 +1,101 @@
+from tools.aoc import AOCDay
+from tools.coordinate import Coordinate
+from typing import Any, Iterable
+
+
+DIRECTIONS = [Coordinate(1, 0), Coordinate(0, 1), Coordinate(-1, 0), Coordinate(0, -1)]
+DIR_TRANS = {'R': 0, 'D': 1, 'L': 2, 'U': 3}
+
+
+def get_borders(coords: set[tuple[Coordinate, Coordinate]]) -> (int, int, int, int):
+    """min_x, max_x, min_y, max_y"""
+    minX = list(sorted(coords))[0][0][0]
+    minY = list(sorted(coords, key=lambda d: (d[0][1], d[0][0])))[0][0][1]
+    maxX = list(sorted(coords, reverse=True))[0][0][0]
+    maxY = list(sorted(coords, key=lambda d: (d[0][1], d[0][0]), reverse=True))[0][0][1]
+
+    return minX, maxX, minY, maxY
+
+
+def split_polygon(coords: set[tuple[Coordinate, Coordinate]], cut_idx: int, horizontal: bool) -> (set[Coordinate], set[Coordinate]):
+    """split the polygon described by coords at cut_idx horizontally or vertically and return both resulting polygons"""
+    if horizontal:
+        vertical_edges = {x for x in coords if x[0].x == x[1].x}
+        intersecting_edges = {x for x in vertical_edges if min(x[0].y, x[1].y) <= cut_idx <= max(x[0].y, x[1].y)}
+        above = set()
+        below = set()
+        for c in coords:
+            if c in intersecting_edges:
+                # split into two
+                # c = ((from_x, from_y), (to_x, to_y))
+                c_1 = (c[0], Coordinate(c[1].x, cut_idx))
+                c_2 = (Coordinate(c[0].x, cut_idx), c[1])
+                if c[0].y <= cut_idx:
+                    above.add(c_1)
+                    below.add(c_2)
+                else:
+                    above.add(c_2)
+                    below.add(c_1)
+            else:
+                if c[0].y <= cut_idx:
+                    above.add(c)
+                if c[0].y >= cut_idx:
+                    below.add(c)
+        return above, below
+
+
+def get_inside_area(coords: set[tuple[Coordinate, Coordinate]]) -> int:
+    min_x, max_x, min_y, max_y = get_borders(coords)
+    if len(coords) == 4:  # rectangle, hopefully
+        return (max_x - min_x - 1) * (max_y - min_y - 1)
+    else:
+        if max_x - min_x > max_y - min_y:
+            half_1, half_2 = split_polygon(coords, (max_x - min_x) // 2, horizontal=False)
+        else:
+            half_1, half_2 = split_polygon(coords, (max_y - min_y) // 2, horizontal=True)
+        return get_inside_area(half_1) + get_inside_area(half_2)
+
+class Day(AOCDay):
+    inputs = [
+        [
+            (62, "input18_test"),
+            (50603, "input18"),
+        ],
+        [
+            (952408144115, "input18_test"),
+            (None, "input18"),
+        ]
+    ]
+
+    def parse_input(self, part2: bool = False) -> Iterable[tuple[int, int]]:
+        for line in self.getInput():
+            d, s, c = line.split()
+            if not part2:
+                yield DIR_TRANS[d], int(s)
+            else:
+                yield int(c[-2]), int(c[2:-2], 16)
+
+    def get_lagoon_area(self, part2: bool = False) -> int:
+        start = Coordinate(0, 0)
+        edges = set()
+        perimeter = 0
+        for d, l in self.parse_input(part2):
+            perimeter += l
+            end = start + DIRECTIONS[d] * l
+            edges.add((start, end))
+            start = end
+
+        print(split_polygon(edges, 4, True))
+
+        #return get_inside_area(edges) + perimeter
+
+    def part1(self) -> Any:
+        return self.get_lagoon_area()
+
+    def part2(self) -> Any:
+        return ""
+
+
+if __name__ == '__main__':
+    day = Day(2023, 18)
+    day.run(verbose=True)
diff --git a/inputs/input18 b/inputs/input18
new file mode 100644
index 0000000..38bda17
--- /dev/null
+++ b/inputs/input18
@@ -0,0 +1,670 @@
+R 5 (#4f4602)
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+L 3 (#2c6d22)
+U 3 (#7a2931)
+L 2 (#6701d2)
+U 7 (#4cc381)
+R 5 (#1a4512)
+U 8 (#3ed731)
+R 5 (#3b6510)
+U 7 (#6aa701)
+L 2 (#094e20)
+U 3 (#915aa3)
+L 8 (#51f690)
+U 6 (#1feb03)
+L 4 (#50f990)
+U 8 (#1ec891)
+L 5 (#40dee0)
+U 4 (#5ff961)
+L 8 (#40dee2)
+U 3 (#3283b1)
+L 4 (#24fdf0)
+U 9 (#6105b1)
+L 3 (#7a6ac0)
+U 5 (#526101)
+L 3 (#4783d2)
+D 9 (#7da9e1)
+L 4 (#2af352)
+U 9 (#0e3ea1)
+L 5 (#39ce52)
+D 5 (#68e421)
+L 6 (#228070)
+U 4 (#66e011)
+L 4 (#228072)
+U 4 (#3ab461)
+L 4 (#536572)
+U 3 (#6feee3)
+L 3 (#33fcf2)
+U 7 (#073003)
+L 3 (#54c3a2)
+U 4 (#231ef3)
+L 3 (#54c3a0)
+U 8 (#703ac3)
+R 5 (#22e582)
+U 9 (#947293)
+L 5 (#0599f2)
+U 5 (#6a7f13)
+L 3 (#74d552)
+U 7 (#07bf23)
+L 9 (#154f92)
+U 4 (#389ee3)
diff --git a/inputs/input18_test b/inputs/input18_test
new file mode 100644
index 0000000..0ad754b
--- /dev/null
+++ b/inputs/input18_test
@@ -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