diff --git a/island.ts b/island.ts
index 740b5e3..8e3fd15 100644
--- a/island.ts
+++ b/island.ts
@@ -12,6 +12,7 @@ export function IslandApplet() {
   // STATE
 
   let timerId: number;
+  let ticks = 0;
   let islands = new IslandGrid(WIDTH, HEIGHT, DEFAULT_SEED);
 
   // UI
@@ -30,12 +31,15 @@ export function IslandApplet() {
       onclick: () => {
         clearInterval(timerId);
 
+        ticks = 0;
         islands = new IslandGrid(WIDTH, HEIGHT, seedInput.valueAsNumber);
 
         timerId = setInterval(function tick() {
           islands.step();
           islands.step();
           islands.step();
+
+          ticks += 3;
           if (islands.done) {
             clearInterval(timerId);
           }