===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,334 @@
-/****
+/**** 
+* Plugins
+****/ 
+var tween = LK.import("@upit/tween.v1");
+
+/**** 
+* Classes
+****/ 
+// Acid Bubble (obstacle)
+var AcidBubble = Container.expand(function () {
+	var self = Container.call(this);
+	var bubble = self.attachAsset('acidBubble', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.radius = bubble.width / 2;
+	self.vx = (Math.random() - 0.5) * 6;
+	self.vy = (Math.random() - 0.5) * 6;
+	self.update = function () {
+		self.x += self.vx;
+		self.y += self.vy;
+		// Bounce off belly walls
+		if (self.x < snakeBelly.x - snakeBelly.width / 2 + self.radius) {
+			self.x = snakeBelly.x - snakeBelly.width / 2 + self.radius;
+			self.vx *= -1;
+		}
+		if (self.x > snakeBelly.x + snakeBelly.width / 2 - self.radius) {
+			self.x = snakeBelly.x + snakeBelly.width / 2 - self.radius;
+			self.vx *= -1;
+		}
+		if (self.y < snakeBelly.y - snakeBelly.height / 2 + self.radius) {
+			self.y = snakeBelly.y - snakeBelly.height / 2 + self.radius;
+			self.vy *= -1;
+		}
+		if (self.y > snakeBelly.y + snakeBelly.height / 2 - self.radius) {
+			self.y = snakeBelly.y + snakeBelly.height / 2 - self.radius;
+			self.vy *= -1;
+		}
+	};
+	return self;
+});
+// Animal class
+var Animal = Container.expand(function () {
+	var self = Container.call(this);
+	// Asset id is passed in as self.assetId
+	var animalSprite = self.attachAsset(self.assetId, {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.radius = animalSprite.width / 2;
+	// Used for movement
+	self.vx = 0;
+	self.vy = 0;
+	self.isSelected = false;
+	// Called every tick
+	self.update = function () {
+		// Gravity inside snake
+		self.vy += 0.5;
+		self.x += self.vx;
+		self.y += self.vy;
+		// Friction
+		self.vx *= 0.95;
+		self.vy *= 0.95;
+		// Keep inside belly bounds
+		if (self.x < snakeBelly.x - snakeBelly.width / 2 + self.radius) {
+			self.x = snakeBelly.x - snakeBelly.width / 2 + self.radius;
+			self.vx *= -0.5;
+		}
+		if (self.x > snakeBelly.x + snakeBelly.width / 2 - self.radius) {
+			self.x = snakeBelly.x + snakeBelly.width / 2 - self.radius;
+			self.vx *= -0.5;
+		}
+		if (self.y < snakeBelly.y - snakeBelly.height / 2 + self.radius) {
+			self.y = snakeBelly.y - snakeBelly.height / 2 + self.radius;
+			self.vy *= -0.5;
+		}
+		if (self.y > snakeBelly.y + snakeBelly.height / 2 - self.radius) {
+			self.y = snakeBelly.y + snakeBelly.height / 2 - self.radius;
+			self.vy *= -0.5;
+		}
+	};
+	// Touch down on animal
+	self.down = function (x, y, obj) {
+		self.isSelected = true;
+		selectedAnimal = self;
+		dragOffsetX = self.x - x;
+		dragOffsetY = self.y - y;
+	};
+	// Touch up
+	self.up = function (x, y, obj) {
+		self.isSelected = false;
+		selectedAnimal = null;
+	};
+	return self;
+});
+
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-	backgroundColor: 0x000000
-});
\ No newline at end of file
+	backgroundColor: 0x222222
+});
+
+/**** 
+* Game Code
+****/ 
+// Sound for animal jump
+// Exit (esophagus opening)
+// Obstacle (stomach acid bubble)
+// Snake exterior (for outside interaction)
+// Snake belly (background)
+// Animal shapes (simple colored ellipses for each animal)
+// --- Global variables ---
+var animalIds = ['pig', 'cat', 'bee', 'frog', 'polarBear', 'elephant', 'bird', 'snail', 'axolotl', 'pinkFox', 'boyBat', 'wolf', 'chinchilla', 'moth', 'goat', 'bunny', 'bear', 'deer'];
+var animals = [];
+var acidBubbles = [];
+var selectedAnimal = null;
+var dragOffsetX = 0;
+var dragOffsetY = 0;
+var insideMode = true; // true: inside snake, false: outside
+var snakeBelly, snakeSkin, exitNode;
+var scoreTxt;
+var rescuedCount = 0;
+var totalToRescue = 5; // MVP: rescue 5 animals to win
+// --- Setup snake belly (inside) ---
+snakeBelly = LK.getAsset('snakeBelly', {
+	anchorX: 0.5,
+	anchorY: 0.5,
+	x: 2048 / 2,
+	y: 1200
+});
+game.addChild(snakeBelly);
+// --- Setup exit (esophagus opening) ---
+exitNode = LK.getAsset('exit', {
+	anchorX: 0.5,
+	anchorY: 0.5,
+	x: 2048 / 2,
+	y: 800
+});
+game.addChild(exitNode);
+// --- Setup animals ---
+function spawnAnimals() {
+	animals = [];
+	var startX = 2048 / 2 - 400;
+	var startY = 1200;
+	for (var i = 0; i < totalToRescue; i++) {
+		var id = animalIds[i];
+		var animal = new Animal();
+		animal.assetId = id;
+		animal.x = startX + i * 200;
+		animal.y = startY + Math.random() * 100 - 50;
+		animal.vx = (Math.random() - 0.5) * 6;
+		animal.vy = (Math.random() - 0.5) * 6;
+		animals.push(animal);
+		game.addChild(animal);
+	}
+}
+spawnAnimals();
+// --- Setup acid bubbles (obstacles) ---
+function spawnAcidBubbles() {
+	acidBubbles = [];
+	for (var i = 0; i < 3; i++) {
+		var bubble = new AcidBubble();
+		bubble.x = 2048 / 2 + (Math.random() - 0.5) * 600;
+		bubble.y = 1200 + (Math.random() - 0.5) * 300;
+		acidBubbles.push(bubble);
+		game.addChild(bubble);
+	}
+}
+spawnAcidBubbles();
+// --- Setup score text ---
+scoreTxt = new Text2('0', {
+	size: 120,
+	fill: "#fff"
+});
+scoreTxt.anchor.set(0.5, 0);
+LK.gui.top.addChild(scoreTxt);
+// --- Setup snake skin (outside) ---
+snakeSkin = LK.getAsset('snakeSkin', {
+	anchorX: 0.5,
+	anchorY: 0,
+	x: 2048 / 2,
+	y: 0
+});
+// Not added yet; only shown in outside mode
+// --- Helper: reset game state ---
+function resetGame() {
+	// Remove all animals and bubbles
+	for (var i = 0; i < animals.length; i++) animals[i].destroy();
+	for (var i = 0; i < acidBubbles.length; i++) acidBubbles[i].destroy();
+	animals = [];
+	acidBubbles = [];
+	rescuedCount = 0;
+	scoreTxt.setText('0');
+	insideMode = true;
+	if (snakeSkin.parent) snakeSkin.parent.removeChild(snakeSkin);
+	if (!snakeBelly.parent) game.addChild(snakeBelly);
+	if (!exitNode.parent) game.addChild(exitNode);
+	spawnAnimals();
+	spawnAcidBubbles();
+}
+// --- Touch/drag logic ---
+game.move = function (x, y, obj) {
+	if (!insideMode) return;
+	if (selectedAnimal) {
+		// Move animal with finger
+		selectedAnimal.x = x + dragOffsetX;
+		selectedAnimal.y = y + dragOffsetY;
+	}
+};
+game.down = function (x, y, obj) {
+	if (!insideMode) return;
+	// Check if any animal is touched
+	for (var i = 0; i < animals.length; i++) {
+		var a = animals[i];
+		var dx = x - a.x;
+		var dy = y - a.y;
+		if (dx * dx + dy * dy < a.radius * a.radius) {
+			a.down(x, y, obj);
+			return;
+		}
+	}
+};
+game.up = function (x, y, obj) {
+	if (!insideMode) return;
+	if (selectedAnimal) {
+		// Give a jump impulse upwards
+		selectedAnimal.vy = -18;
+		selectedAnimal.vx = (Math.random() - 0.5) * 8;
+		LK.getSound('jump').play();
+		selectedAnimal.up(x, y, obj);
+	}
+};
+// --- Outside mode: tap snake skin to help animals escape ---
+snakeSkin.down = function (x, y, obj) {
+	if (!insideMode) {
+		// "Massage" the snake: all animals get a little upward boost
+		for (var i = 0; i < animals.length; i++) {
+			animals[i].vy -= 10 + Math.random() * 6;
+		}
+		// Animate snake skin
+		tween(snakeSkin, {
+			y: 20
+		}, {
+			duration: 120,
+			easing: tween.easeOut,
+			onFinish: function onFinish() {
+				tween(snakeSkin, {
+					y: 0
+				}, {
+					duration: 180,
+					easing: tween.easeIn
+				});
+			}
+		});
+	}
+};
+// --- Game update loop ---
+game.update = function () {
+	// Switch between inside/outside every 10 seconds
+	if (LK.ticks % 600 === 0) {
+		insideMode = !insideMode;
+		if (insideMode) {
+			// Show inside
+			if (!snakeBelly.parent) game.addChild(snakeBelly);
+			if (!exitNode.parent) game.addChild(exitNode);
+			if (snakeSkin.parent) snakeSkin.parent.removeChild(snakeSkin);
+		} else {
+			// Show outside
+			if (!snakeSkin.parent) game.addChild(snakeSkin);
+			if (snakeBelly.parent) snakeBelly.parent.removeChild(snakeBelly);
+			if (exitNode.parent) exitNode.parent.removeChild(exitNode);
+		}
+	}
+	// Update animals
+	for (var i = animals.length - 1; i >= 0; i--) {
+		var a = animals[i];
+		a.update();
+		// If animal touches exit, rescue it!
+		if (insideMode && a.intersects(exitNode)) {
+			// Animate out
+			tween(a, {
+				y: exitNode.y - 200
+			}, {
+				duration: 400,
+				easing: tween.easeIn,
+				onFinish: function onFinish() {
+					a.destroy();
+				}
+			});
+			animals.splice(i, 1);
+			rescuedCount++;
+			scoreTxt.setText(rescuedCount);
+			// Win condition
+			if (rescuedCount >= totalToRescue) {
+				LK.showYouWin();
+				return;
+			}
+		}
+	}
+	// Update acid bubbles
+	for (var i = acidBubbles.length - 1; i >= 0; i--) {
+		var b = acidBubbles[i];
+		b.update();
+		// If any animal hits a bubble, game over
+		for (var j = 0; j < animals.length; j++) {
+			var a = animals[j];
+			var dx = a.x - b.x;
+			var dy = a.y - b.y;
+			var dist = a.radius + b.radius - 10;
+			if (dx * dx + dy * dy < dist * dist) {
+				LK.effects.flashScreen(0xff0000, 800);
+				LK.showGameOver();
+				return;
+			}
+		}
+	}
+};
+// --- Reset game on game over or win ---
+LK.on('gameover', function () {
+	resetGame();
+});
+LK.on('youwin', function () {
+	resetGame();
+});
+// --- Instructions text ---
+var instructions = new Text2("Drag animals to help them jump to the exit!\nAvoid acid bubbles.\nSometimes tap the snake's back to help!", {
+	size: 60,
+	fill: "#fff"
+});
+instructions.anchor.set(0.5, 0);
+LK.gui.top.addChild(instructions);
+instructions.y = 180;
+instructions.x = 2048 / 2;
\ No newline at end of file