diff --git a/2025/day09/part1.py b/2025/day09/part1.py
new file mode 100644
index 0000000..0e65676
--- /dev/null
+++ b/2025/day09/part1.py
@@ -0,0 +1,18 @@
+from __future__ import annotations
+
+text: str
+
+with open("input.txt") as f:
+    text = f.read()
+
+points: list[list[int]] = [list(map(int, line.split(","))) for line in text.splitlines()]
+
+max_area: int = 0
+for i, point in enumerate(points):
+    x, y = point
+    areas: list[int] = []
+    for x2, y2 in points:
+        areas.append(abs(((x - x2) + 1) * ((y - y2) + 1)))
+    max_area = max(max(areas), max_area)
+
+print(max_area)