===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,393 @@
-/****
+/**** 
+* Plugins
+****/ 
+var tween = LK.import("@upit/tween.v1");
+
+/**** 
+* Classes
+****/ 
+// Checkpoint class: save progress
+var Checkpoint = Container.expand(function () {
+	var self = Container.call(this);
+	var cp = self.attachAsset('checkpoint', {
+		anchorX: 0.5,
+		anchorY: 1
+	});
+	self.activated = false;
+	self.activate = function () {
+		if (!self.activated) {
+			self.activated = true;
+			tween(cp, {
+				tint: 0x00ff00
+			}, {
+				duration: 300
+			});
+		}
+	};
+	return self;
+});
+// Platform class: static or moving platform
+var Platform = Container.expand(function () {
+	var self = Container.call(this);
+	// Attach platform asset (box shape)
+	var plat = self.attachAsset('platform', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	// Platform movement config
+	self.isMoving = false;
+	self.moveAxis = 'x'; // 'x' or 'y'
+	self.moveFrom = 0;
+	self.moveTo = 0;
+	self.moveDuration = 0;
+	self.moveDir = 1;
+	// For moving platforms, set up tween
+	self.startMove = function () {
+		if (!self.isMoving) return;
+		var prop = {};
+		prop[self.moveAxis] = self.moveTo;
+		tween(self, prop, {
+			duration: self.moveDuration,
+			easing: tween.linear,
+			onFinish: function onFinish() {
+				// Swap direction
+				var tmp = self.moveFrom;
+				self.moveFrom = self.moveTo;
+				self.moveTo = tmp;
+				self.startMove();
+			}
+		});
+	};
+	return self;
+});
+// Player class: main character
+var Player = Container.expand(function () {
+	var self = Container.call(this);
+	var _char = self.attachAsset('player', {
+		anchorX: 0.5,
+		anchorY: 1
+	});
+	self.width = _char.width;
+	self.height = _char.height;
+	self.vx = 0;
+	self.vy = 0;
+	self.onGround = false;
+	self.dead = false;
+	self.jumpQueued = false;
+	self.respawn = function (x, y) {
+		self.x = x;
+		self.y = y;
+		self.vx = 0;
+		self.vy = 0;
+		self.dead = false;
+	};
+	return self;
+});
+// Spike class: deadly obstacle
+var Spike = Container.expand(function () {
+	var self = Container.call(this);
+	// Attach spike asset (triangle shape, but use box for now)
+	var spike = self.attachAsset('spike', {
+		anchorX: 0.5,
+		anchorY: 1
+	});
+	return self;
+});
+
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-	backgroundColor: 0x000000
-});
\ No newline at end of file
+	backgroundColor: 0x222222
+});
+
+/**** 
+* Game Code
+****/ 
+/*
+	Level is an array of objects:
+	{type: 'platform'|'spike'|'checkpoint', x, y, [w], [h], [moveAxis], [moveFrom], [moveTo], [moveDuration]}
+	All positions are in game coordinates.
+*/
+// --- Level Data (MVP: 1 level, hardcoded) ---
+// Tween plugin for platform/character movement and effects
+// --- Asset Initialization ---
+var levelData = [
+// Floor
+{
+	type: 'platform',
+	x: 1024,
+	y: 2600,
+	w: 1200,
+	h: 60
+},
+// First jump
+{
+	type: 'platform',
+	x: 600,
+	y: 2200,
+	w: 400,
+	h: 40
+}, {
+	type: 'spike',
+	x: 800,
+	y: 2160
+},
+// Second jump
+{
+	type: 'platform',
+	x: 1400,
+	y: 2000,
+	w: 400,
+	h: 40
+}, {
+	type: 'spike',
+	x: 1200,
+	y: 1960
+},
+// Moving platform
+{
+	type: 'platform',
+	x: 1024,
+	y: 1700,
+	w: 300,
+	h: 40,
+	moveAxis: 'x',
+	moveFrom: 724,
+	moveTo: 1324,
+	moveDuration: 1800
+}, {
+	type: 'spike',
+	x: 1024,
+	y: 1660
+},
+// Checkpoint
+{
+	type: 'checkpoint',
+	x: 1024,
+	y: 1600
+},
+// Final platform
+{
+	type: 'platform',
+	x: 1024,
+	y: 1200,
+	w: 400,
+	h: 40
+},
+// End spike
+{
+	type: 'spike',
+	x: 1024,
+	y: 1160
+}];
+// --- Game State ---
+var platforms = [];
+var spikes = [];
+var checkpoints = [];
+var player = null;
+var currentCheckpoint = null;
+var deaths = 0;
+var levelEndY = 1100; // Y position to reach to win
+// --- UI ---
+var deathsTxt = new Text2('Deaths: 0', {
+	size: 90,
+	fill: "#fff"
+});
+deathsTxt.anchor.set(0.5, 0);
+LK.gui.top.addChild(deathsTxt);
+// --- Level Construction ---
+function buildLevel() {
+	// Clear previous
+	for (var i = 0; i < platforms.length; ++i) platforms[i].destroy();
+	for (var i = 0; i < spikes.length; ++i) spikes[i].destroy();
+	for (var i = 0; i < checkpoints.length; ++i) checkpoints[i].destroy();
+	platforms = [];
+	spikes = [];
+	checkpoints = [];
+	currentCheckpoint = null;
+	// Build
+	for (var i = 0; i < levelData.length; ++i) {
+		var obj = levelData[i];
+		if (obj.type === 'platform') {
+			var plat = new Platform();
+			plat.x = obj.x;
+			plat.y = obj.y;
+			plat.width = obj.w || 400;
+			plat.height = obj.h || 40;
+			plat.children[0].width = plat.width;
+			plat.children[0].height = plat.height;
+			if (obj.moveAxis) {
+				plat.isMoving = true;
+				plat.moveAxis = obj.moveAxis;
+				plat.moveFrom = obj.moveFrom;
+				plat.moveTo = obj.moveTo;
+				plat.moveDuration = obj.moveDuration;
+				plat[plat.moveAxis] = plat.moveFrom;
+				plat.startMove();
+			}
+			game.addChild(plat);
+			platforms.push(plat);
+		} else if (obj.type === 'spike') {
+			var spike = new Spike();
+			spike.x = obj.x;
+			spike.y = obj.y;
+			game.addChild(spike);
+			spikes.push(spike);
+		} else if (obj.type === 'checkpoint') {
+			var cp = new Checkpoint();
+			cp.x = obj.x;
+			cp.y = obj.y;
+			game.addChild(cp);
+			checkpoints.push(cp);
+		}
+	}
+}
+// --- Player Spawn ---
+function spawnPlayer() {
+	if (player) player.destroy();
+	player = new Player();
+	var spawnX = 1024,
+		spawnY = 2500;
+	if (currentCheckpoint) {
+		spawnX = currentCheckpoint.x;
+		spawnY = currentCheckpoint.y - 10;
+	}
+	player.respawn(spawnX, spawnY);
+	game.addChild(player);
+}
+// --- Death/Respawn ---
+function killPlayer() {
+	if (player.dead) return;
+	player.dead = true;
+	deaths += 1;
+	deathsTxt.setText('Deaths: ' + deaths);
+	LK.effects.flashScreen(0xff2222, 400);
+	LK.setTimeout(function () {
+		spawnPlayer();
+	}, 400);
+}
+// --- Win Condition ---
+function checkWin() {
+	if (player.y < levelEndY) {
+		LK.showYouWin();
+	}
+}
+// --- Collision Helpers ---
+function rectsIntersect(a, b) {
+	return a.x - a.width / 2 < b.x + b.width / 2 && a.x + a.width / 2 > b.x - b.width / 2 && a.y - a.height < b.y && a.y > b.y - b.height;
+}
+// --- Touch Controls (Mobile) ---
+var touchLeft = false,
+	touchRight = false,
+	touchJump = false;
+var dragStartX = null,
+	dragStartY = null;
+var dragActive = false;
+// Touch areas: left 1/3 = left, right 1/3 = right, bottom 1/3 = jump
+game.down = function (x, y, obj) {
+	if (y > 2732 - 400) {
+		touchJump = true;
+		player.jumpQueued = true;
+	} else if (x < 2048 / 3) {
+		touchLeft = true;
+	} else if (x > 2048 * 2 / 3) {
+		touchRight = true;
+	}
+};
+game.up = function (x, y, obj) {
+	touchLeft = false;
+	touchRight = false;
+	touchJump = false;
+	player.jumpQueued = false;
+};
+game.move = function (x, y, obj) {
+	// No drag controls for MVP
+};
+// --- Physics Constants ---
+var GRAVITY = 2.2;
+var MOVE_SPEED = 18;
+var JUMP_VEL = -48;
+var MAX_FALL = 60;
+// --- Game Update Loop ---
+game.update = function () {
+	if (!player || player.dead) return;
+	// Horizontal movement
+	if (touchLeft) {
+		player.vx = -MOVE_SPEED;
+	} else if (touchRight) {
+		player.vx = MOVE_SPEED;
+	} else {
+		player.vx = 0;
+	}
+	// Jump
+	if (player.jumpQueued && player.onGround) {
+		player.vy = JUMP_VEL;
+		player.onGround = false;
+		player.jumpQueued = false;
+	}
+	// Gravity
+	player.vy += GRAVITY;
+	if (player.vy > MAX_FALL) player.vy = MAX_FALL;
+	// Save old position
+	var oldX = player.x,
+		oldY = player.y;
+	// Move X
+	player.x += player.vx;
+	// Collide with platforms (X axis)
+	for (var i = 0; i < platforms.length; ++i) {
+		var plat = platforms[i];
+		if (rectsIntersect(player, plat)) {
+			if (player.vx > 0) {
+				player.x = plat.x - plat.width / 2 - player.width / 2;
+			} else if (player.vx < 0) {
+				player.x = plat.x + plat.width / 2 + player.width / 2;
+			}
+			player.vx = 0;
+		}
+	}
+	// Move Y
+	player.y += player.vy;
+	player.onGround = false;
+	// Collide with platforms (Y axis)
+	for (var i = 0; i < platforms.length; ++i) {
+		var plat = platforms[i];
+		if (rectsIntersect(player, plat)) {
+			if (player.vy > 0) {
+				player.y = plat.y - plat.height / 2;
+				player.onGround = true;
+			} else if (player.vy < 0) {
+				player.y = plat.y + plat.height / 2 + player.height;
+			}
+			player.vy = 0;
+		}
+	}
+	// Collide with spikes
+	for (var i = 0; i < spikes.length; ++i) {
+		var spike = spikes[i];
+		if (rectsIntersect(player, spike)) {
+			killPlayer();
+			return;
+		}
+	}
+	// Collide with checkpoints
+	for (var i = 0; i < checkpoints.length; ++i) {
+		var cp = checkpoints[i];
+		if (!cp.activated && rectsIntersect(player, cp)) {
+			cp.activate();
+			currentCheckpoint = cp;
+		}
+	}
+	// Out of bounds (fall)
+	if (player.y > 2800) {
+		killPlayer();
+		return;
+	}
+	// Win
+	checkWin();
+};
+// --- Build Level and Start ---
+buildLevel();
+spawnPlayer();
+deaths = 0;
+deathsTxt.setText('Deaths: 0');
\ No newline at end of file