===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,293 @@
-/****
+/**** 
+* Plugins
+****/ 
+var tween = LK.import("@upit/tween.v1");
+
+/**** 
+* Classes
+****/ 
+var Enemy = Container.expand(function (type, x, y) {
+	var self = Container.call(this);
+	self.type = type;
+	self.isVisible = false;
+	var enemyGraphics = self.attachAsset(type === 'light' ? 'lightEnemy' : 'shadowEnemy', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.x = x;
+	self.y = y;
+	self.updateVisibility = function () {
+		if (self.type === 'light') {
+			self.isVisible = currentRealm === 'light';
+		} else {
+			self.isVisible = currentRealm === 'shadow';
+		}
+		enemyGraphics.alpha = self.isVisible ? 1.0 : 0.3;
+	};
+	self.update = function () {
+		self.x -= gameSpeed;
+		self.updateVisibility();
+		if (self.isVisible && runner.intersects(self)) {
+			LK.getSound('hit').play();
+			gameOver();
+		}
+		if (self.x < -100) {
+			self.destroy();
+			for (var i = enemies.length - 1; i >= 0; i--) {
+				if (enemies[i] === self) {
+					enemies.splice(i, 1);
+					break;
+				}
+			}
+		}
+	};
+	return self;
+});
+var Platform = Container.expand(function (type, x, y) {
+	var self = Container.call(this);
+	self.type = type;
+	self.isVisible = false;
+	var platformGraphics = self.attachAsset(type === 'light' ? 'lightPlatform' : 'shadowPlatform', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.x = x;
+	self.y = y;
+	self.updateVisibility = function () {
+		if (self.type === 'light') {
+			self.isVisible = currentRealm === 'light';
+		} else {
+			self.isVisible = currentRealm === 'shadow';
+		}
+		platformGraphics.alpha = self.isVisible ? 1.0 : 0.3;
+	};
+	self.update = function () {
+		self.x -= gameSpeed;
+		self.updateVisibility();
+		if (self.x < -200) {
+			self.destroy();
+			for (var i = platforms.length - 1; i >= 0; i--) {
+				if (platforms[i] === self) {
+					platforms.splice(i, 1);
+					break;
+				}
+			}
+		}
+	};
+	return self;
+});
+var PowerUp = Container.expand(function (x, y) {
+	var self = Container.call(this);
+	var powerupGraphics = self.attachAsset('powerup', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.x = x;
+	self.y = y;
+	self.collected = false;
+	self.update = function () {
+		self.x -= gameSpeed;
+		self.rotation += 0.1;
+		if (!self.collected && runner.intersects(self)) {
+			self.collected = true;
+			LK.getSound('collect').play();
+			LK.setScore(LK.getScore() + 10);
+			scoreTxt.setText(LK.getScore());
+			self.destroy();
+			for (var i = powerups.length - 1; i >= 0; i--) {
+				if (powerups[i] === self) {
+					powerups.splice(i, 1);
+					break;
+				}
+			}
+		}
+		if (self.x < -50) {
+			self.destroy();
+			for (var i = powerups.length - 1; i >= 0; i--) {
+				if (powerups[i] === self) {
+					powerups.splice(i, 1);
+					break;
+				}
+			}
+		}
+	};
+	return self;
+});
+var Runner = Container.expand(function () {
+	var self = Container.call(this);
+	var runnerGraphics = self.attachAsset('runner', {
+		anchorX: 0.5,
+		anchorY: 1.0
+	});
+	self.velocityY = 0;
+	self.gravity = 0.8;
+	self.jumpPower = -18;
+	self.onGround = false;
+	self.lastGrounded = false;
+	self.update = function () {
+		// Apply gravity
+		self.velocityY += self.gravity;
+		self.y += self.velocityY;
+		// Check platform collisions
+		self.onGround = false;
+		for (var i = 0; i < platforms.length; i++) {
+			var platform = platforms[i];
+			if (platform.isVisible && self.intersects(platform)) {
+				if (self.velocityY > 0 && self.y - 80 < platform.y) {
+					self.y = platform.y;
+					self.velocityY = 0;
+					self.onGround = true;
+					break;
+				}
+			}
+		}
+		// Check if fell off screen
+		if (self.y > 2732 + 100) {
+			gameOver();
+		}
+		self.lastGrounded = self.onGround;
+	};
+	return self;
+});
+
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-	backgroundColor: 0x000000
-});
\ No newline at end of file
+	backgroundColor: 0x87ceeb
+});
+
+/**** 
+* Game Code
+****/ 
+var currentRealm = 'light';
+var gameSpeed = 8;
+var runner;
+var platforms = [];
+var enemies = [];
+var powerups = [];
+var spawnTimer = 0;
+var gameRunning = true;
+var distance = 0;
+// UI Elements
+var scoreTxt = new Text2('Score: 0', {
+	size: 60,
+	fill: 0xFFFFFF
+});
+scoreTxt.anchor.set(0, 0);
+scoreTxt.x = 150;
+scoreTxt.y = 50;
+LK.gui.topLeft.addChild(scoreTxt);
+var realmTxt = new Text2('Light Realm', {
+	size: 50,
+	fill: 0xFFD700
+});
+realmTxt.anchor.set(0.5, 0);
+realmTxt.x = 0;
+realmTxt.y = 50;
+LK.gui.top.addChild(realmTxt);
+var distanceTxt = new Text2('Distance: 0', {
+	size: 40,
+	fill: 0xFFFFFF
+});
+distanceTxt.anchor.set(1, 0);
+distanceTxt.x = -20;
+distanceTxt.y = 50;
+LK.gui.topRight.addChild(distanceTxt);
+// Initialize runner
+runner = game.addChild(new Runner());
+runner.x = 300;
+runner.y = 1500;
+// Create initial platforms
+for (var i = 0; i < 10; i++) {
+	var platformType = Math.random() < 0.5 ? 'light' : 'shadow';
+	var platform = game.addChild(new Platform(platformType, 400 + i * 300, 1500 + Math.random() * 400 - 200));
+	platforms.push(platform);
+}
+function switchRealm() {
+	if (currentRealm === 'light') {
+		currentRealm = 'shadow';
+		game.setBackgroundColor(0x2c1810);
+		realmTxt.setText('Shadow Realm');
+		realmTxt.style.fill = "#663399";
+	} else {
+		currentRealm = 'light';
+		game.setBackgroundColor(0x87ceeb);
+		realmTxt.setText('Light Realm');
+		realmTxt.style.fill = "#ffd700";
+	}
+	LK.getSound('realmSwitch').play();
+	LK.effects.flashScreen(currentRealm === 'light' ? 0xffd700 : 0x663399, 200);
+}
+function jump() {
+	if (runner.onGround) {
+		runner.velocityY = runner.jumpPower;
+		LK.getSound('jump').play();
+	}
+}
+function spawnPlatform() {
+	var platformType = Math.random() < 0.5 ? 'light' : 'shadow';
+	var platform = game.addChild(new Platform(platformType, 2200, 1200 + Math.random() * 800));
+	platforms.push(platform);
+}
+function spawnEnemy() {
+	if (Math.random() < 0.3) {
+		var enemyType = Math.random() < 0.5 ? 'light' : 'shadow';
+		var enemy = game.addChild(new Enemy(enemyType, 2200, 1400 + Math.random() * 600));
+		enemies.push(enemy);
+	}
+}
+function spawnPowerUp() {
+	if (Math.random() < 0.15) {
+		var powerup = game.addChild(new PowerUp(2200, 1300 + Math.random() * 700));
+		powerups.push(powerup);
+	}
+}
+function gameOver() {
+	if (gameRunning) {
+		gameRunning = false;
+		LK.effects.flashScreen(0xff0000, 1000);
+		LK.showGameOver();
+	}
+}
+// Event handlers
+game.down = function (x, y, obj) {
+	if (gameRunning) {
+		if (y < 1366) {
+			switchRealm();
+		} else {
+			jump();
+		}
+	}
+};
+// Main game loop
+game.update = function () {
+	if (!gameRunning) return;
+	// Update distance and score
+	distance += gameSpeed;
+	if (LK.ticks % 10 === 0) {
+		LK.setScore(LK.getScore() + 1);
+		scoreTxt.setText('Score: ' + LK.getScore());
+		distanceTxt.setText('Distance: ' + Math.floor(distance / 10));
+	}
+	// Increase difficulty over time
+	if (LK.ticks % 600 === 0) {
+		gameSpeed += 0.5;
+	}
+	// Spawn new elements
+	spawnTimer++;
+	if (spawnTimer >= 60) {
+		spawnPlatform();
+		spawnEnemy();
+		spawnPowerUp();
+		spawnTimer = 0;
+	}
+	// Update all platforms visibility
+	for (var i = 0; i < platforms.length; i++) {
+		platforms[i].updateVisibility();
+	}
+	// Update all enemies visibility
+	for (var i = 0; i < enemies.length; i++) {
+		enemies[i].updateVisibility();
+	}
+};
\ No newline at end of file