===================================================================
--- original.js
+++ change.js
@@ -4,9 +4,9 @@
 /**** // Block class
 var Block = Container.expand(function () {
 var self = Container.call(this);
 var blockGraphics = self.createAsset('block', 'Regular Block', 0.5, 1);
-blockGraphics.scale.set(0.8); // Same size as a spike block
+blockGraphics.scale.set(1.6); // Two times bigger than the original size
 self.speed = Obstacle.baseSpeed;
 self.move = function () {
 self.x -= self.speed;
 if (self.x < -blockGraphics.width) {
@@ -75,9 +75,9 @@
 // BouncePad class
 var BouncePad = Container.expand(function () {
 	var self = Container.call(this);
 	var bouncePadGraphics = self.createAsset('bouncePad', 'Bounce Pad', 0.5, 1);
-	bouncePadGraphics.scale.set(0.8);
+	bouncePadGraphics.scale.set(1.6); // Two times bigger than the original size
 	self.move = function () {
 		self.x -= Obstacle.baseSpeed;
 		if (self.x < -bouncePadGraphics.width) {
 			self.destroy();
@@ -87,9 +87,9 @@
 // SpikeBlock class
 var SpikeBlock = Container.expand(function () {
 	var self = Container.call(this);
 	var spikeBlockGraphics = self.createAsset('spikeBlock', 'Spike Block', 0.5, 1);
-	spikeBlockGraphics.scale.set(0.6); // Smaller than a wall block
+	spikeBlockGraphics.scale.set(1.2); // Two times bigger than the original size
 	self.speed = Obstacle.baseSpeed;
 	self.move = function () {
 		self.x -= self.speed;
 		if (self.x < -spikeBlockGraphics.width) {
@@ -100,9 +100,9 @@
 // Boulder class
 var Boulder = Container.expand(function () {
 	var self = Container.call(this);
 	var boulderGraphics = self.createAsset('boulder', 'Boulder', 0.5, 1);
-	boulderGraphics.scale.set(1.0); // Same size as a wall block
+	boulderGraphics.scale.set(2.0); // Two times bigger than the original size
 	self.speed = Obstacle.baseSpeed;
 	self.move = function () {
 		self.x -= self.speed;
 		if (self.x < -boulderGraphics.width) {