diff --git a/src/levels/rooftop.js b/src/levels/rooftop.js
new file mode 100644
index 0000000..6879c1e
--- /dev/null
+++ b/src/levels/rooftop.js
@@ -0,0 +1,37 @@
+// Seed #3: the rooftop. The cat starts on the left roof, a water tower stands on the right roof.
+// Roof tops are one-way platforms. The door on the left roof leads down to the lobby; walk off the left edge for the alley.
+import { PAL } from "../palette.js";
+import { blit } from "../sprites.js";
+
+const BLOCKS = [
+  { x: 0, y: 96, w: 80, h: 84, rows: 5 },
+  { x: 86, y: 128, w: 62, h: 52, rows: 3 },
+  { x: 154, y: 114, w: 60, h: 66, rows: 4 },
+  { x: 222, y: 92, w: 98, h: 88, rows: 5 },
+];
+
+export default {
+  name: "rooftop",
+  label: "rooftop",
+  platforms: BLOCKS.map((b) => ({ x: b.x, y: b.y, w: b.w })),
+  start: { x: 30, y: 90 },
+  bossAt: { x: 262, y: 92 },
+  exits: { left: { to: "alley", at: { x: 300, y: 150 } } },
+  doors: [{ x: 52, y: 84, to: "lobby", at: { x: 40, y: 150 } }],
+  boss: null,
+  spawn: [],
+  music: "rooftop-a",
+  draw(g) {
+    for (const b of BLOCKS) {
+      g.fillStyle = PAL.wall; g.fillRect(b.x, b.y, b.w, b.h);
+      g.fillStyle = PAL.roof; g.fillRect(b.x - 1, b.y, b.w + 2, 4);
+      g.fillStyle = PAL.ink; g.fillRect(b.x - 1, b.y + 4, b.w + 2, 1);
+      let i = (b.x * 7) % 5;
+      for (let r = 0; r < b.rows; r++) for (let x = b.x + 8; x < b.x + b.w - 8; x += 14) {
+        i++; g.fillStyle = i % 3 === 0 ? PAL.winOff : PAL.light;
+        g.fillRect(x, b.y + 12 + r * 16, 7, 9); g.fillStyle = PAL.ink; g.fillRect(x + 3, b.y + 12 + r * 16, 1, 9);
+      }
+    }
+    blit(g, "tower", 282, 70);
+  },
+};