diff --git a/2025/day04.ua b/2025/day04.ua
new file mode 100644
index 0000000..59e0aef
--- /dev/null
+++ b/2025/day04.ua
@@ -0,0 +1,12 @@
+~ "aoc.ua" ~ Lines
+
+Input ← Lines &fras "input/day04.txt"
+Wall  ← ≡◇=@@ Input
+
+/⊂ -₁⇡[3 3]
+▽¬⍜⍉(⊡1)⊸⦷0_0
+
+/+ ⬚0˜↻ Wall
+<4
+×Wall
+/+♭