===================================================================
--- original.js
+++ change.js
@@ -149,16 +149,16 @@
 var rightObstacleSpawnTime = Math.floor(Math.random() * obstacleSpawnRandomness) + obstacleSpawnRandomness;
 bird.x = 1024;
 bird.y = 1366;
 game.isMouseDown = false;
-game.on('down', function (x, y, obj) {
+game.down = function (x, y, obj) {
 	bird.flap();
 	game.isMouseDown = true;
-});
-game.on('up', function (x, y, obj) {
+};
+game.up = function (x, y, obj) {
 	game.isMouseDown = false;
-});
-LK.on('tick', function () {
+};
+game.update = function () {
 	bird._update_migrated();
 	if (game.score > 2) {
 		tutorialText.y += 5;
 		tutorialTextWhite.y += 5;
@@ -209,5 +209,5 @@
 	if (bird.y < 0 || bird.y > 2732) {
 		LK.setScore(game.score);
 		LK.showGameOver();
 	}
-});
\ No newline at end of file
+};
\ No newline at end of file