You can now actually lose the game.

tetris-control.js

@@ -2,8 +2,11 @@ var game = null;
 
 function doTurn() {
 	document.onkeypress = onKeyPressed;
-	game.doTurn();
-	window.setTimeout(doTurn, 333);
+	if (game.doTurn()) {
+		window.setTimeout(doTurn, 333);
+	} else {
+		alert('You lost!');
+	}
 }
 
 function onKeyPressed(e) {
@@ -31,4 +34,4 @@ function onKeyPressed(e) {
 $(document).ready(function() {
 	game = new TetrisGame("tetris-board");
 	doTurn();
-});
+});