===================================================================
--- original.js
+++ change.js
@@ -14,8 +14,20 @@
 	self.update = function () {
 		// Update logic for the hero, such as movement
 	};
 });
+var LeftButton = Container.expand(function () {
+	var self = Container.call(this);
+	var buttonGraphics = self.attachAsset('leftButton', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.x = 150;
+	self.y = 2732 - 150;
+	self.down = function (x, y, obj) {
+		hero.x -= hero.speed;
+	};
+});
 // Obstacle class representing obstacles in the game
 var Obstacle = Container.expand(function () {
 	var self = Container.call(this);
 	var obstacleGraphics = self.attachAsset('obstacle', {
@@ -45,8 +57,9 @@
 var hero = game.addChild(new Hero());
 hero.x = 2048 / 2;
 hero.y = 2732 - 200;
 var obstacles = [];
+var leftButton = game.addChild(new LeftButton());
 var score = 0;
 var scoreTxt = new Text2('0', {
 	size: 150,
 	fill: "#ffffff"