/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");

/**** 
* Classes
****/ 
// Hamster (player) class
var Hamster = Container.expand(function () {
	var self = Container.call(this);
	var hamsterSprite = self.attachAsset('hamster', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.radius = hamsterSprite.width * 0.5;
	// For collision, use self.x, self.y, self.radius
	// No per-instance update needed; movement is handled by drag
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0xffffff
});

/**** 
* Game Code
****/ 
// Game constants
var GAME_WIDTH = 2048;
var GAME_HEIGHT = 2732;
var HAMSTER_START_X = GAME_WIDTH / 2;
var HAMSTER_START_Y = GAME_HEIGHT - 500;
// Game state
var hamster = null;
var dragNode = null;
// --- Infinite grass background ---
var bgGrass1 = LK.getAsset('grass', {
	anchorX: 0,
	anchorY: 0,
	width: GAME_WIDTH,
	height: GAME_HEIGHT
});
var bgGrass2 = LK.getAsset('grass', {
	anchorX: 0,
	anchorY: 0,
	width: GAME_WIDTH,
	height: GAME_HEIGHT
});
bgGrass1.y = 0;
bgGrass2.y = -GAME_HEIGHT;
game.addChild(bgGrass1);
game.addChild(bgGrass2);
// --- Hamster ---
// Allow dragging hamster from anywhere on the screen
hamster = new Hamster();
hamster.x = HAMSTER_START_X;
hamster.y = HAMSTER_START_Y;
game.addChild(hamster);
game.down = function (x, y, obj) {
	dragNode = hamster;
};
game.up = function (x, y, obj) {
	dragNode = null;
};
game.move = function (x, y, obj) {
	if (dragNode) {
		// Clamp hamster to game area
		var nx = x;
		var ny = y;
		var r = hamster.radius;
		if (nx < r) nx = r;
		if (nx > GAME_WIDTH - r) nx = GAME_WIDTH - r;
		if (ny < r + 100) ny = r + 100; // Don't allow top 100px (menu)
		if (ny > GAME_HEIGHT - r) ny = GAME_HEIGHT - r;
		hamster.x = nx;
		hamster.y = ny;
	}
};
// --- Game update ---
game.update = function () {
	// Scroll background grass
	var speed = 8;
	bgGrass1.y += speed;
	bgGrass2.y += speed;
	// Loop grass backgrounds
	if (bgGrass1.y >= GAME_HEIGHT) {
		bgGrass1.y = bgGrass2.y - GAME_HEIGHT;
	}
	if (bgGrass2.y >= GAME_HEIGHT) {
		bgGrass2.y = bgGrass1.y - GAME_HEIGHT;
	}
};

===================================================================
--- original.js
+++ change.js
@@ -54,19 +54,15 @@
 bgGrass2.y = -GAME_HEIGHT;
 game.addChild(bgGrass1);
 game.addChild(bgGrass2);
 // --- Hamster ---
+// Allow dragging hamster from anywhere on the screen
 hamster = new Hamster();
 hamster.x = HAMSTER_START_X;
 hamster.y = HAMSTER_START_Y;
 game.addChild(hamster);
-// --- Drag controls ---
 game.down = function (x, y, obj) {
-	var dx = x - hamster.x;
-	var dy = y - hamster.y;
-	if (dx * dx + dy * dy < hamster.radius * hamster.radius) {
-		dragNode = hamster;
-	}
+	dragNode = hamster;
 };
 game.up = function (x, y, obj) {
 	dragNode = null;
 };