===================================================================
--- original.js
+++ change.js
@@ -1,57 +1,61 @@
-/****
+/**** 
 * Classes
-****/
+****/ 
 //<Assets used in the game will automatically appear here>
 //<Write imports for supported plugins here>
 // Hero class representing the player character
 var Hero = Container.expand(function () {
-  var self = Container.call(this);
-  var heroGraphics = self.attachAsset('hero', {
-    anchorX: 0.5,
-    anchorY: 0.5
-  });
-  self.speed = 10;
-  self.update = function () {
-    // Update logic for hero
-  };
+	var self = Container.call(this);
+	var heroGraphics = self.attachAsset('hero', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = 10;
+	self.update = function () {
+		// Update logic for hero
+	};
 });
 // Bullet class for hero's bullets
 var HeroBullet = Container.expand(function () {
-  var self = Container.call(this);
-  var bulletGraphics = self.attachAsset('bullet', {
-    anchorX: 0.5,
-    anchorY: 0.5
-  });
-  self.speed = -15;
-  self.update = function () {
-    self.y += self.speed;
-  };
+	var self = Container.call(this);
+	var bulletGraphics = self.attachAsset('bullet', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = -15;
+	self.update = function () {
+		self.y += self.speed;
+	};
 });
 // Zombie class representing enemy characters
 var Zombie = Container.expand(function () {
-  var self = Container.call(this);
-  var zombieGraphics = self.attachAsset('zombie', {
-    anchorX: 0.5,
-    anchorY: 0.5
-  });
-  self.speed = 2;
-  self.update = function () {
-    // Update logic for zombie
-    self.y += self.speed;
-  };
+	var self = Container.call(this);
+	var zombieGraphics = self.attachAsset('zombie', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = 2;
+	self.update = function () {
+		// Update logic for zombie
+		self.y += self.speed;
+		// Randomly change direction
+		if (Math.random() < 0.01) {
+			self.speed = -self.speed;
+		}
+	};
 });
 
-/****
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-  backgroundColor: 0x000000 //Init game with black background 
+	backgroundColor: 0x000000 //Init game with black background 
 });
 
-/****
+/**** 
 * Game Code
-****/
+****/ 
 // Initialize hero
 var hero = game.addChild(new Hero());
 hero.x = 2048 / 2;
 hero.y = 2732 - 200;
@@ -60,72 +64,74 @@
 // Array to keep track of bullets
 var bullets = [];
 // Function to spawn a new zombie
 function spawnZombie() {
-  var zombie = new Zombie();
-  zombie.x = Math.random() * 2048;
-  zombie.y = -50;
-  zombies.push(zombie);
-  game.addChild(zombie);
+	var zombie = new Zombie();
+	zombie.x = Math.random() * 2048;
+	zombie.y = -50;
+	zombies.push(zombie);
+	game.addChild(zombie);
+	// Randomly set the zombie's speed
+	zombie.speed = Math.random() * 4 - 2;
 }
 // Function to handle shooting
 function shootBullet() {
-  var bullet = new HeroBullet();
-  bullet.x = hero.x;
-  bullet.y = hero.y;
-  bullets.push(bullet);
-  game.addChild(bullet);
+	var bullet = new HeroBullet();
+	bullet.x = hero.x;
+	bullet.y = hero.y;
+	bullets.push(bullet);
+	game.addChild(bullet);
 }
 // Game update loop
 game.update = function () {
-  // Update hero
-  hero.update();
-  // Update zombies
-  for (var i = zombies.length - 1; i >= 0; i--) {
-    var zombie = zombies[i];
-    zombie.update();
-    if (zombie.y > 2732) {
-      zombie.destroy();
-      zombies.splice(i, 1);
-    }
-  }
-  // Update bullets
-  for (var j = bullets.length - 1; j >= 0; j--) {
-    var bullet = bullets[j];
-    bullet.update();
-    if (bullet.y < 0) {
-      bullet.destroy();
-      bullets.splice(j, 1);
-    }
-  }
-  // Check for collisions between bullets and zombies
-  for (var k = bullets.length - 1; k >= 0; k--) {
-    var bullet = bullets[k];
-    for (var l = zombies.length - 1; l >= 0; l--) {
-      var zombie = zombies[l];
-      if (bullet.intersects(zombie)) {
-        bullet.destroy();
-        bullets.splice(k, 1);
-        zombie.destroy();
-        zombies.splice(l, 1);
-        break;
-      }
-    }
-  }
-  // Spawn new zombies periodically
-  if (LK.ticks % 60 === 0) {
-    spawnZombie();
-  }
+	// Update hero
+	hero.update();
+	// Update zombies
+	for (var i = zombies.length - 1; i >= 0; i--) {
+		var zombie = zombies[i];
+		zombie.update();
+		if (zombie.y > 2732) {
+			zombie.destroy();
+			zombies.splice(i, 1);
+		}
+	}
+	// Update bullets
+	for (var j = bullets.length - 1; j >= 0; j--) {
+		var bullet = bullets[j];
+		bullet.update();
+		if (bullet.y < 0) {
+			bullet.destroy();
+			bullets.splice(j, 1);
+		}
+	}
+	// Check for collisions between bullets and zombies
+	for (var k = bullets.length - 1; k >= 0; k--) {
+		var bullet = bullets[k];
+		for (var l = zombies.length - 1; l >= 0; l--) {
+			var zombie = zombies[l];
+			if (bullet.intersects(zombie)) {
+				bullet.destroy();
+				bullets.splice(k, 1);
+				zombie.destroy();
+				zombies.splice(l, 1);
+				break;
+			}
+		}
+	}
+	// Spawn new zombies periodically
+	if (LK.ticks % 60 === 0) {
+		spawnZombie();
+	}
 };
 // Handle touch events for moving the hero
 game.down = function (x, y, obj) {
-  hero.x = x;
-  hero.y = y;
+	hero.x = x;
+	hero.y = y;
 };
 game.move = function (x, y, obj) {
-  hero.x = x;
-  hero.y = y;
+	hero.x = x;
+	hero.y = y;
 };
 // Handle shooting on touch release
 game.up = function (x, y, obj) {
-  shootBullet();
+	shootBullet();
 };
\ No newline at end of file