diff --git a/data/example/2025/12.txt b/data/example/2025/12.txt
new file mode 100644
index 000000000..e69de29
diff --git a/src/solution/year_2025/day_12.py b/src/solution/year_2025/day_12.py
new file mode 100644
index 000000000..4cd5a0e
--- /dev/null
+++ b/src/solution/year_2025/day_12.py
@@ -0,0 +1,65 @@
+import functools
+from typing import Any
+
+
+class Shape:
+    def __init__(self, shape: list[str]):
+        self.shape = shape
+
+    @functools.cached_property
+    def size(self) -> int:
+        return sum(sum(x == "#" for x in s) for s in self.shape)
+
+
+class Grid:
+    def __init__(self, a: int, b: int, amount: list[int]) -> None:
+        self.a = a
+        self.b = b
+        self.amount = amount
+
+    @functools.cached_property
+    def size(self) -> int:
+        return self.a * self.b
+
+
+def _parse_input(input_data: str) -> tuple[list[Shape], list[Grid]]:
+    *_shapes, _grids = input_data.split("\n\n")
+
+    shapes = []
+    for s in _shapes:
+        shapes.append(Shape(s.splitlines()[1:]))
+
+    grids = []
+    for g in _grids.splitlines():
+        size, amount = g.split(": ")
+        a, b = size.split("x")
+
+        grids.append(Grid(int(a), int(b), list(map(int, amount.split()))))
+
+    return shapes, grids
+
+
+def part_1(input_data: str) -> Any:
+    shapes, grids = _parse_input(input_data)
+
+    s = 0
+    for g in grids:
+        gifts = sum(a * b.size for a, b in zip(g.amount, shapes, strict=True))
+
+        # all cases are trivial xd
+        if gifts <= g.size:
+            s += 1
+
+    return s
+
+
+def part_2(_: str) -> Any:
+    return "Marry Christmas!"
+
+
+def test_part_1(example_data):
+    assert part_1(example_data) == 0
+
+
+def test_part_2(example_data):
+    assert part_2(example_data) == 0