diff --git a/day13.ua b/day13.ua
new file mode 100644
index 0000000..61ea49f
--- /dev/null
+++ b/day13.ua
@@ -0,0 +1,35 @@
+$ #.##..##.
+$ ..#.##.#.
+$ ##......#
+$ ##......#
+$ ..#.##.#.
+$ ..##..##.
+$ #.#.##.#.
+$ 
+$ #...##..#
+$ #....#..#
+$ ..##..###
+$ #####.##.
+$ #####.##.
+$ ..##..###
+$ #....#..#
+TestInput ←
+
+Parse ← ⊜(□=@#⊜∘≠@\n.)¬⌕"\n\n".
+
+PartI ← +⊙(×100)∩(
+  -⊃(⧻|×2+1⊚|:)≡≍⬚0↻1..
+  /+▽⊓(≡(/×≡≍⇌.↘)⊙¤|+1⊚)
+)⍉.°□
+
+# apparently adding a comment here fixes highlighting lol
+PartII ← +⊙(×100)∩(
+  -⊃(⧻|×2+1⊚|:)⍜(⊢⇌|⋅0)+1⊚⧻.?
+  /+▽⊓(≡(×⊃(/×+|=2/+)≡⊃(=1/+≠|≍)⇌.↘)⊙¤|+1⊚)
+)⍉.°□
+
+/+≡PartI Parse TestInput
+/+≡PartII Parse TestInput
+
+/+≡PartI Parse &fras "day13.in"
+/+≡PartII Parse &fras "day13.in"