gistfile1.txt

diff --git a/sky/sdk/example/mine_digger/lib/main.dart b/sky/sdk/example/mine_digger/lib/main.dart
index aa20563..ad2dc99 100644
--- a/sky/sdk/example/mine_digger/lib/main.dart
+++ b/sky/sdk/example/mine_digger/lib/main.dart
@@ -4,6 +4,7 @@
 
 import 'dart:sky' as sky;
 import 'dart:math';
+import 'dart:async';
 
 import 'package:sky/rendering/flex.dart';
 import 'package:sky/widgets/basic.dart';
@@ -361,6 +362,9 @@ class MineDiggerApp extends App {
 
   MineDiggerApp() {
     game = new Game(this);
+    new Timer.periodic(const Duration(milliseconds:20), (_) {
+      scheduleBuild();
+    });
   }
 
   Widget build() {