===================================================================
--- original.js
+++ change.js
@@ -1,7 +1,19 @@
 /**** 
 * Classes
 ****/ 
+// Create a class for the bullet
+var Bullet = Container.expand(function () {
+	var self = Container.call(this);
+	var bulletGraphics = self.attachAsset('bullet', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.update = function () {
+		// Bullet's behavior goes here
+		self.y -= 5;
+	};
+});
 // Create a class for the enemy pigs
 var EnemyPig = Container.expand(function () {
 	var self = Container.call(this);
 	var pigGraphics = self.attachAsset('enemyPig', {
@@ -75,9 +87,23 @@
 	enemyPigs.push(enemyPig);
 	game.addChild(enemyPig);
 }, 2000);
 // Update the game state every frame
+window.addEventListener('keydown', function (event) {
+	if (event.code === 'Space') {
+		var bullet = new Bullet();
+		bullet.x = playerPig.x;
+		bullet.y = playerPig.y;
+		game.addChild(bullet);
+	}
+});
 game.update = function () {
+	// Update the bullets
+	for (var i = game.children.length - 1; i >= 0; i--) {
+		if (game.children[i] instanceof Bullet && game.children[i].y < -game.children[i].height / 2) {
+			game.removeChild(game.children[i]);
+		}
+	}
 	// Move the enemy pigs down the screen
 	for (var i = 0; i < enemyPigs.length; i++) {
 		enemyPigs[i].y += 5;
 		// If an enemy pig has reached the bottom of the screen, remove it