===================================================================
--- original.js
+++ change.js
@@ -178,8 +178,33 @@
 		self.y = 50;
 	};
 	self.positionAtTopRight();
 });
+// Define the ScoreDisplay class
+var ScoreDisplay = Container.expand(function () {
+	var self = Container.call(this);
+	var scoreLabel = new Text2('SCORE', {
+		size: 50,
+		fill: "#ffffff"
+	});
+	scoreLabel.anchor.set(0.5, 0);
+	scoreLabel.y = -60;
+	self.addChild(scoreLabel);
+	var scoreText = new Text2('Score: 0', {
+		size: 100,
+		fill: "#ffffff"
+	});
+	scoreText.anchor.set(0.5, 0);
+	self.addChild(scoreText);
+	self.updateScore = function (score) {
+		scoreText.setText('Score: ' + score);
+	};
+	self.positionAtTopLeft = function () {
+		self.x = 20;
+		self.y = 50;
+	};
+	self.positionAtTopLeft();
+});
 // Define the LivesDisplay class
 var LivesDisplay = Container.expand(function () {
 	var self = Container.call(this);
 	self.lives = 6;
@@ -235,8 +260,11 @@
 	star.y = Math.random() * 2732;
 	stars.push(star);
 	game.addChild(star);
 }
+// Instantiate ScoreDisplay
+var scoreDisplay = new ScoreDisplay();
+LK.gui.topLeft.addChild(scoreDisplay);
 // Instantiate LivesDisplay
 var livesDisplay = new LivesDisplay();
 // Instantiate WaveDisplay
 var waveDisplay = new WaveDisplay();
@@ -322,8 +350,9 @@
 				aliens[m].health--;
 				if (aliens[m].health <= 0) {
 					// Update score for destroying an alien
 					LK.setScore(LK.getScore() + 100);
+					scoreDisplay.updateScore(LK.getScore());
 					aliens[m].destroy();
 					aliens.splice(m, 1);
 				}
 				// Destroy the hero bullet