diff --git a/island.ts b/island.ts
index a15b2bb..5e13e86 100644
--- a/island.ts
+++ b/island.ts
@@ -1,9 +1,9 @@
 import { canvas2d } from "./lib/html";
 import { Prng, mulberry32 } from "./lib/prng";
 
-const BLOWUP = 4;
-const WIDTH = 240;
-const HEIGHT = 135;
+const BLOWUP = 4 * 5;
+const WIDTH = 240 / 5;
+const HEIGHT = 135 / 5;
 
 type Lookup2d = (x: number, y: number) => number;
 function dim(width: number, height: number): Lookup2d {
@@ -104,12 +104,14 @@ export function IslandApplet() {
 
   const islands = new IslandGrid(WIDTH, HEIGHT, 128);
 
-  function tick() {
-    const pos = islands.rng() % islands.data.length;
+  const basePos = islands.data.length >> 1;
 
-    islands
-      .floodSearch(pos, (tile) => tile > 0)
-      .forEach((pos) => islands.data[pos]++);
+  function tick() {
+    const islandTiles = islands.floodSearch(basePos, (tile) => tile > 0);
+
+    const pos = islandTiles[islands.rng() % islandTiles.length];
+
+    islands.data[pos]++;
 
     renderIslands(islands, cx);
   }