===================================================================
--- original.js
+++ change.js
@@ -104,8 +104,24 @@
 	};
 });
 var Game = Container.expand(function () {
 	var self = Container.call(this);
+	self.canMove = function () {
+		for (var i = 0; i < gridSize; i++) {
+			for (var j = 0; j < gridSize; j++) {
+				if (squares[i][j] === null) {
+					return true;
+				}
+				if (j !== 0 && squares[i][j].value === squares[i][j - 1].value) {
+					return true;
+				}
+				if (i !== 0 && squares[i][j].value === squares[i - 1][j].value) {
+					return true;
+				}
+			}
+		}
+		return false;
+	};
 	var scoreTxt = new Text2('2', {
 		size: 220,
 		fill: '#000000',
 		font: 'Impact'
@@ -330,7 +346,10 @@
 					}));
 				}));
 				scoreTxt.setText(maxTileValue.toString());
 			}
+			if (!self.canMove()) {
+				LK.showGameOver();
+			}
 		}
 	});
 });