===================================================================
--- original.js
+++ change.js
@@ -48,15 +48,10 @@
 	switch (shapeType) {
 		case 'circle':
 			shapeGraphics = LK.getAsset('circle', 'Circle Shape', 0.5, 0.5);
 			break;
-		case 'triangle':
-			shapeGraphics = LK.getAsset('triangle', 'Triangle Shape', 0.5, 0.5);
-			break;
-		case 'square':
-			shapeGraphics = LK.getAsset('square', 'Square Shape', 0.5, 0.5);
-			break;
 	}
+	shapeGraphics.alpha = 0.5;
 	self.addChild(shapeGraphics);
 	self.isCollided = true;
 	self.scale.set(1, 1);
 	var scaleUp = function () {
@@ -81,32 +76,24 @@
 });
 var Shape = Container.expand(function () {
 	var self = Container.call(this);
 	var shapeType = 'circle';
-	var color = '#' + (Math.random() * 0xFFFFFF << 0).toString(16).padStart(6, '0');
 	var shapeGraphics;
 	switch (shapeType) {
 		case 'circle':
 			shapeGraphics = LK.getAsset('circle', 'Circle Shape', 0.5, 0.5);
 			break;
-		case 'triangle':
-			shapeGraphics = LK.getAsset('triangle', 'Triangle Shape', 0.5, 0.5);
-			break;
-		case 'square':
-			shapeGraphics = LK.getAsset('square', 'Square Shape', 0.5, 0.5);
-			break;
 	}
 	self.updateColor = function () {
 		var h = self.colorIndex / 32;
 		var s = 0.8;
 		var v = 0.8;
 		self.color = hsvToRgb(h, s, v);
 		shapeGraphics.tint = self.color;
-		self.colorIndex = (self.colorIndex + 1) % 32;
 	};
 	self.colorIndex = Math.floor(Math.random() * 32);
 	self.updateColor();
-	shapeGraphics.alpha = 0.2;
+	shapeGraphics.alpha = 0.5;
 	self.addChild(shapeGraphics);
 	var angle = Math.random() * Math.PI * 2;
 	var speed = 5;
 	self.vx = Math.cos(angle) * speed;
@@ -114,12 +101,12 @@
 	self.move = function () {
 		if (!self.isCollided) {
 			self.x += self.vx;
 			self.y += self.vy;
-			if (self.x < 0 || self.x > 2048 - self.width) {
+			if (self.x - self.width / 2 < 0 || self.x > 2048 - self.width / 2) {
 				self.vx = -self.vx;
 			}
-			if (self.y < 0 || self.y > 2732 - self.height) {
+			if (self.y - self.height / 2 < 0 || self.y > 2732 - self.height / 2) {
 				self.vy = -self.vy;
 			}
 		} else {
 			self.vx = 0;
@@ -152,34 +139,33 @@
 	self.chain = function () {};
 });
 var Game = Container.expand(function () {
 	var self = Container.call(this);
-	var bgColor = hsvToRgb(1, 1, 1);
-	LK.stageContainer.setBackgroundColor(bgColor);
+	LK.stageContainer.setBackgroundColor('0xCCCCFF');
 	var shapes = [];
 	var levelText = new Text2('Level 1 - Explode 1 of 5 shapes', {
 		size: 80,
 		fill: "#ffffff",
 		align: 'center'
 	});
 	levelText.anchor.set(0.5, 0);
 	levelText.x = 0;
-	levelText.y = 150;
+	levelText.y = 50;
 	var collisionsCount = 0;
 	var collisionText = new Text2('Exploded: ' + collisionsCount, {
 		size: 80,
 		fill: "#ffffff",
 		align: 'center'
 	});
 	collisionText.anchor.set(0.5, 0);
 	collisionText.x = 0;
-	collisionText.y = 250;
+	collisionText.y = 150;
 	LK.gui.topCenter.addChild(levelText);
 	LK.gui.topCenter.addChild(collisionText);
 	for (var i = 0; i < 15; i++) {
 		var shape = self.addChild(new Shape());
-		shape.x = Math.random() * (1024 - shape.width);
-		shape.y = Math.random() * (1366 - shape.height);
+		shape.x = shape.width + Math.random() * (2048 - 2 * shape.width);
+		shape.y = shape.height + Math.random() * (2732 - 2 * shape.height);
 		shapes.push(shape);
 	}
 	var isClicked = false;
 	stage.on('down', function (obj) {