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

/**** 
* Classes
****/ 
// Bird class
var Bird = Container.expand(function () {
	var self = Container.call(this);
	// Attach a red ellipse as the main bird body
	var birdBody = self.attachAsset('bird', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	birdBody.width = 90;
	birdBody.height = 90;
	// Add a white ellipse for the belly
	var belly = self.attachAsset('bird', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	belly.width = birdBody.width * 0.7;
	belly.height = birdBody.height * 0.5;
	belly.x = 0;
	belly.y = birdBody.height * 0.18;
	belly.tint = 0xffffff;
	// Add a black ellipse for the left eye
	var leftEye = self.attachAsset('bird', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	leftEye.width = birdBody.width * 0.18;
	leftEye.height = birdBody.height * 0.18;
	leftEye.x = -birdBody.width * 0.18;
	leftEye.y = -birdBody.height * 0.18;
	leftEye.tint = 0x000000;
	// Add a black ellipse for the right eye
	var rightEye = self.attachAsset('bird', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	rightEye.width = birdBody.width * 0.18;
	rightEye.height = birdBody.height * 0.18;
	rightEye.x = birdBody.width * 0.08;
	rightEye.y = -birdBody.height * 0.18;
	rightEye.tint = 0x000000;
	// Physics properties
	self.vx = 0;
	self.vy = 0;
	self.launched = false;
	self.radius = birdBody.width / 2;
	self.gravity = 0.35;
	self.friction = 0.998;
	self.bounce = 0.5;
	self.stopped = false;
	// Called every tick
	self.update = function () {
		// Track lastX and lastY for physics events
		if (typeof self.lastX === "undefined") self.lastX = self.x;
		if (typeof self.lastY === "undefined") self.lastY = self.y;
		if (self.launched && !self.stopped) {
			// Standard projectile physics, no tracking or homing
			self.vy += self.gravity;
			self.x += self.vx;
			self.y += self.vy;
			// Friction
			self.vx *= self.friction;
			self.vy *= self.friction;
			// Floor collision
			if (self.y + self.radius > groundY) {
				self.y = groundY - self.radius;
				if (Math.abs(self.vy) > 2) {
					self.vy = -self.vy * self.bounce;
					self.vx *= 0.8;
					self.stopped = false; // Don't stop if still bouncing
				} else {
					self.vy = 0;
					self.vx *= 0.8;
					// Only stop if both vx and vy are very small and bird is on ground
					if (Math.abs(self.vx) < 1 && Math.abs(self.vy) < 0.5) {
						self.stopped = true;
					} else {
						self.stopped = false;
					}
				}
			}
			// Wall collision
			if (self.x - self.radius < 0) {
				self.x = self.radius;
				self.vx = -self.vx * self.bounce;
			}
			if (self.x + self.radius > 2048) {
				self.x = 2048 - self.radius;
				self.vx = -self.vx * self.bounce;
			}
		}
		// Update lastX and lastY after movement
		if (typeof self.x === "number" && !isNaN(self.x)) {
			self.lastX = self.x;
		} else if (typeof self.x === "string" && !isNaN(parseFloat(self.x))) {
			self.lastX = parseFloat(self.x);
		} else if (typeof self.lastX === "number" && !isNaN(self.lastX)) {
			// keep previous
		} else {
			self.lastX = 0;
		}
		if (typeof self.y === "number" && !isNaN(self.y)) {
			self.lastY = self.y;
		} else if (typeof self.y === "string" && !isNaN(parseFloat(self.y))) {
			self.lastY = parseFloat(self.y);
		} else if (typeof self.lastY === "number" && !isNaN(self.lastY)) {
			// keep previous
		} else {
			self.lastY = 0;
		}
		// Defensive: always ensure lastY is a number
		if (typeof self.lastY !== "number" || isNaN(self.lastY)) {
			self.lastY = 0;
		}
	};
	// Simple circle collision
	self.intersectsCircle = function (other) {
		var dx = self.x - other.x;
		var dy = self.y - other.y;
		var dist = Math.sqrt(dx * dx + dy * dy);
		return dist < self.radius + other.radius;
	};
	return self;
});
// Block class with gravity and simple physics
var Block = Container.expand(function () {
	var self = Container.call(this);
	// Attach block asset
	var blockAsset = self.attachAsset('block', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Set width/height after attach
	self.width = blockAsset.width;
	self.height = blockAsset.height;
	// Physics properties
	self.vx = 0;
	self.vy = 0;
	self.gravity = 0.7;
	self.friction = 0.98;
	self.bounce = 0.2;
	self.stopped = false;
	// Called every tick
	self.update = function () {
		// Track lastX and lastY for physics events
		if (typeof self.lastX === "undefined") self.lastX = self.x;
		if (typeof self.lastY === "undefined") self.lastY = self.y;
		if (!self.stopped) {
			self.vy += self.gravity;
			self.x += self.vx;
			self.y += self.vy;
			self.vx *= self.friction;
			self.vy *= self.friction;
			// Floor collision
			if (self.y + self.height / 2 > groundY) {
				self.y = groundY - self.height / 2;
				if (Math.abs(self.vy) > 2) {
					self.vy = -self.vy * self.bounce;
					self.vx *= 0.8;
				} else {
					self.vy = 0;
					self.vx *= 0.8;
					if (Math.abs(self.vx) < 1 && Math.abs(self.vy) < 0.5) {
						self.stopped = true;
					} else {
						self.stopped = false;
					}
				}
			}
			// Wall collision
			if (self.x - self.width / 2 < 0) {
				self.x = self.width / 2;
				self.vx = -self.vx * self.bounce;
			}
			if (self.x + self.width / 2 > 2048) {
				self.x = 2048 - self.width / 2;
				self.vx = -self.vx * self.bounce;
			}
		}
		// Update lastX and lastY after movement
		self.lastX = self.x;
		self.lastY = self.y;
	};
	return self;
});
// Pig class
var Pig = Container.expand(function () {
	var self = Container.call(this);
	// Attach a green ellipse as the pig
	var pigAsset = self.attachAsset('pig', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.radius = pigAsset.width / 2;
	self.alive = true;
	// Physics properties for pigs
	self.vx = 0;
	self.vy = 0;
	self.gravity = 0.7;
	self.friction = 0.98;
	self.bounce = 0.3;
	self.stopped = false;
	// Called every tick
	self.update = function () {
		if (!self.alive) return;
		// Track lastX and lastY for physics events
		if (typeof self.lastX === "undefined") self.lastX = self.x;
		if (typeof self.lastY === "undefined") self.lastY = self.y;
		if (!self.stopped) {
			self.vy += self.gravity;
			self.x += self.vx;
			self.y += self.vy;
			self.vx *= self.friction;
			self.vy *= self.friction;
			// Pig-on-block collision: prevent pig from going inside the wood blocks
			for (var i = 0; i < blocks.length; i++) {
				var block = blocks[i];
				// Axis-aligned bounding box for block
				var blockLeft = block.x - block.width / 2;
				var blockRight = block.x + block.width / 2;
				var blockTop = block.y - block.height / 2;
				var blockBottom = block.y + block.height / 2;
				// Only check if pig is above block and falling
				if (self.y < block.y && self.vy > 0) {
					// Check horizontal overlap
					if (self.x + self.radius > blockLeft && self.x - self.radius < blockRight) {
						// Check if pig's bottom is entering block's top
						if (self.y + self.radius > blockTop && self.y - self.radius < blockBottom) {
							// Place pig on top of block
							self.y = blockTop - self.radius;
							if (Math.abs(self.vy) > 2) {
								self.vy = -self.vy * self.bounce;
								self.vx *= 0.8;
								// Transfer some force to the block below (crash effect)
								block.vx += self.vx * 0.2;
								block.vy += self.vy * 0.2;
							} else {
								self.vy = 0;
								self.vx *= 0.8;
								if (Math.abs(self.vx) < 1) {
									self.stopped = true;
								}
							}
						}
					}
				}
			}
			// Floor collision
			if (self.y + self.radius > groundY) {
				self.y = groundY - self.radius;
				if (Math.abs(self.vy) > 2) {
					self.vy = -self.vy * self.bounce;
					self.vx *= 0.8;
				} else {
					self.vy = 0;
					self.vx *= 0.8;
					if (Math.abs(self.vx) < 1) {
						self.stopped = true;
					}
				}
			}
			// Wall collision
			if (self.x - self.radius < 0) {
				self.x = self.radius;
				self.vx = -self.vx * self.bounce;
			}
			if (self.x + self.radius > 2048) {
				self.x = 2048 - self.radius;
				self.vx = -self.vx * self.bounce;
			}
		}
		// Update lastX and lastY after movement
		self.lastX = self.x;
		self.lastY = self.y;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x87ceeb // Sky blue
});

/**** 
* Game Code
****/ 
// --- Asset Initialization (shapes) ---
// --- Add Background Image ---
var background = LK.getAsset('block', {
	anchorX: 0,
	anchorY: 0
});
background.width = 2048;
background.height = 2732;
background.tint = 0x87ceeb; // Sky blue tint for now
background.x = 0;
background.y = 0;
game.addChild(background);
// (Sun removed)
// --- Add Trees for Scenery ---
var treeTrunkColor = 0x8b5a2b;
var treeLeafColor = 0x228b22;
var treeCount = 4;
var treeSpacing = 2048 / (treeCount + 1);
for (var i = 0; i < treeCount; i++) {
	// Trunk
	var trunk = LK.getAsset('block', {
		anchorX: 0.5,
		anchorY: 1
	});
	trunk.width = 40;
	trunk.height = 220;
	trunk.tint = treeTrunkColor;
	trunk.x = treeSpacing * (i + 1);
	trunk.y = groundY + 10;
	game.addChild(trunk);
	// Leaves (ellipse)
	var leaves = LK.getAsset('bird', {
		anchorX: 0.5,
		anchorY: 1
	});
	leaves.width = 180;
	leaves.height = 160;
	leaves.tint = treeLeafColor;
	leaves.x = trunk.x;
	leaves.y = trunk.y - trunk.height + 10;
	game.addChild(leaves);
}
// --- Game Variables ---
var birds = [];
var pigs = [];
var blocks = [];
var currentBird = null;
var birdIndex = 0;
var isDragging = false;
var dragStart = {
	x: 0,
	y: 0
};
var dragEnd = {
	x: 0,
	y: 0
};
var slingshotX = 260; // Moved more right from 60
var slingshotY = 2000; // Raised slingshot higher (was 2450)
var slingshotBandLength = 180;
var maxBirds = 5;
var groundY = 2650;
var level = 1;
var launching = false;
var score = 0;
// --- GUI ---
var scoreTxt = new Text2('0', {
	size: 120,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
var birdsLeftTxt = new Text2('', {
	size: 80,
	fill: 0xFFFFFF
});
birdsLeftTxt.anchor.set(0.5, 0);
LK.gui.topRight.addChild(birdsLeftTxt);
// --- Draw Ground ---
var ground = LK.getAsset('ground', {
	anchorX: 0,
	anchorY: 0
});
ground.x = 0;
ground.y = groundY;
game.addChild(ground);
// --- Draw Little Mountain below the slingshot ---
var mountainWidth = 400;
var mountainHeight = 120;
var mountain = LK.getAsset('block', {
	anchorX: 0.5,
	anchorY: 1
});
mountain.width = mountainWidth;
mountain.height = mountainHeight;
mountain.x = slingshotX;
mountain.y = groundY + 10; // Slightly below ground for overlap
mountain.tint = 0x8b7765; // Optional: make it look more like a mountain
game.addChild(mountain);
// --- Draw Slingshot ---
var slingshot = LK.getAsset('slingshot', {
	anchorX: 0.5,
	anchorY: 1
});
slingshot.x = slingshotX;
slingshot.y = slingshotY + 90;
game.addChild(slingshot);
// --- Level Setup ---
function setupLevel() {
	// Add a golden star collectible above the house for bonus points
	if (typeof star === "undefined") {
		star = LK.getAsset('block', {
			anchorX: 0.5,
			anchorY: 0.5
		});
		star.width = 80;
		star.height = 80;
		star.tint = 0xffd700; // gold color
		star.isStar = true;
	}
	star.x = 1500;
	star.y = groundY - 600;
	star.collected = false;
	star.visible = true;
	game.addChild(star);
	// Clear previous
	for (var i = 0; i < birds.length; i++) birds[i].destroy();
	for (var i = 0; i < pigs.length; i++) pigs[i].destroy();
	for (var i = 0; i < blocks.length; i++) blocks[i].destroy();
	birds = [];
	pigs = [];
	blocks = [];
	birdIndex = 0;
	score = 0;
	LK.setScore(0);
	scoreTxt.setText('0');
	launching = false;
	for (var i = 0; i < maxBirds; i++) {
		var bird = new Bird();
		bird.x = slingshotX - 120 - i * 80;
		bird.y = slingshotY + 40;
		birds.push(bird);
		game.addChild(bird);
	}
	currentBird = birds[birdIndex];
	var pig1 = new Pig();
	pig1.x = 1500;
	pig1.y = groundY - 400;
	pigs.push(pig1);
	game.addChild(pig1);
	// (Second pig inside the house removed)
	// --- Add two big wood block boxes stacked on top of each other ---
	// Box parameters
	var boxWidth = 320;
	var boxHeight = 220;
	var blockThickness = 40;
	var box1CenterX = 1500;
	var box1TopY = groundY - 300;
	var box2CenterX = 1500;
	var box2TopY = box1TopY - boxHeight - 80; // 80px gap between boxes
	// Helper to add a box at (centerX, topY)
	function addBox(centerX, topY) {
		// Top horizontal block
		var blockTop = new Block();
		blockTop.width = boxWidth;
		blockTop.height = blockThickness;
		blockTop.x = centerX;
		blockTop.y = topY;
		game.addChild(blockTop);
		blocks.push(blockTop);
		// Bottom horizontal block
		var blockBottom = new Block();
		blockBottom.width = boxWidth;
		blockBottom.height = blockThickness;
		blockBottom.x = centerX;
		blockBottom.y = topY + boxHeight;
		game.addChild(blockBottom);
		blocks.push(blockBottom);
		// Left vertical block
		var blockLeft = new Block();
		blockLeft.width = blockThickness;
		blockLeft.height = boxHeight;
		blockLeft.x = centerX - boxWidth / 2 + blockThickness / 2;
		blockLeft.y = topY + boxHeight / 2;
		game.addChild(blockLeft);
		blocks.push(blockLeft);
		// Right vertical block
		var blockRight = new Block();
		blockRight.width = blockThickness;
		blockRight.height = boxHeight;
		blockRight.x = centerX + boxWidth / 2 - blockThickness / 2;
		blockRight.y = topY + boxHeight / 2;
		game.addChild(blockRight);
		blocks.push(blockRight);
	}
	// First (bottom) box
	addBox(box1CenterX, box1TopY);
	// Second (top) box
	addBox(box2CenterX, box2TopY);
	// Third (topmost) box
	var box3CenterX = 1500;
	var box3TopY = box2TopY - boxHeight - 80; // 80px gap between boxes
	addBox(box3CenterX, box3TopY);
	// --- Ensure blocks and pigs are not hanging in the air ---
	for (var i = 0; i < pigs.length; i++) {
		var pig = pigs[i];
		// Check if pig is supported by ground
		var supported = false;
		// Supported by ground
		if (Math.abs(pig.y + pig.radius - groundY) < 2) {
			supported = true;
		}
		pig.stopped = !supported ? false : pig.stopped;
	}
	updateBirdsLeft();
	// Reset star collectible if it exists
	if (typeof star !== "undefined") {
		star.collected = false;
		star.visible = true;
	}
}
// --- Update birds left text ---
function updateBirdsLeft() {
	birdsLeftTxt.setText('Birds: ' + (maxBirds - birdIndex));
}
// --- Drag and Launch Logic ---
function getDistance(x1, y1, x2, y2) {
	var dx = x2 - x1;
	var dy = y2 - y1;
	return Math.sqrt(dx * dx + dy * dy);
}
function getAngle(x1, y1, x2, y2) {
	return Math.atan2(y2 - y1, x2 - x1);
}
// Only allow drag if not launched
game.down = function (x, y, obj) {
	if (launching) return;
	if (!currentBird || currentBird.launched) return;
	// Only allow drag if touch is near the bird
	var dist = getDistance(x, y, currentBird.x, currentBird.y);
	if (dist < currentBird.radius * 1.5) {
		isDragging = true;
		dragStart.x = x;
		dragStart.y = y;
	}
};
game.move = function (x, y, obj) {
	if (isDragging && currentBird && !currentBird.launched) {
		// Limit drag distance
		var dx = x - slingshotX;
		var dy = y - slingshotY;
		var dist = getDistance(x, y, slingshotX, slingshotY);
		if (dist > slingshotBandLength) {
			var angle = getAngle(slingshotX, slingshotY, x, y);
			dx = Math.cos(angle) * slingshotBandLength;
			dy = Math.sin(angle) * slingshotBandLength;
		}
		currentBird.x = slingshotX + dx;
		currentBird.y = slingshotY + dy;
		dragEnd.x = currentBird.x;
		dragEnd.y = currentBird.y;
	}
};
game.up = function (x, y, obj) {
	if (isDragging && currentBird && !currentBird.launched) {
		isDragging = false;
		// Calculate launch velocity
		var dx = slingshotX - currentBird.x;
		var dy = slingshotY - currentBird.y;
		currentBird.vx = dx * 0.18;
		currentBird.vy = dy * 0.18;
		currentBird.launched = true;
		launching = true;
		// Animate slingshot back
		tween(currentBird, {
			x: currentBird.x,
			y: currentBird.y
		}, {
			duration: 80
		});
	}
};
// --- Main Game Loop ---
game.update = function () {
	// Update all birds
	for (var i = 0; i < birds.length; i++) {
		birds[i].update();
	}
	// Update all pigs
	for (var i = 0; i < pigs.length; i++) {
		pigs[i].update();
	}
	// Update all blocks (gravity/physics)
	for (var i = 0; i < blocks.length; i++) {
		if (typeof blocks[i].update === "function") {
			blocks[i].update();
		}
	}
	// Bird-pig collision
	for (var i = 0; i < birds.length; i++) {
		var bird = birds[i];
		if (!bird.launched) continue;
		if (bird.stopped) continue;
		// Bird-star collision
		if (typeof star !== "undefined" && star.visible && !star.collected && bird.intersectsCircle({
			x: star.x,
			y: star.y,
			radius: star.width / 2
		})) {
			star.collected = true;
			star.visible = false;
			LK.setScore(LK.getScore() + 5000);
			scoreTxt.setText(LK.getScore());
		}
		for (var j = 0; j < pigs.length; j++) {
			var pig = pigs[j];
			if (!pig.alive) continue;
			if (bird.intersectsCircle(pig)) {
				pig.alive = false;
				pig.visible = false;
				LK.setScore(LK.getScore() + 1000);
				scoreTxt.setText(LK.getScore());
			}
		}
	}
	// --- Check support for each pig: if not supported, set stopped = false so it falls ---
	for (var i = 0; i < pigs.length; i++) {
		var pig = pigs[i];
		if (!pig.alive) continue;
		var supported = false;
		// Supported by ground
		if (Math.abs(pig.y + pig.radius - groundY) < 2) {
			supported = true;
		}
		if (!supported) {
			pig.stopped = false;
		}
	}
	// Remove dead pigs
	var allPigsDead = true;
	for (var i = 0; i < pigs.length; i++) {
		if (pigs[i].alive) {
			allPigsDead = false;
			break;
		}
	}
	// If all pigs dead, win (only if there was at least one pig)
	if (pigs.length > 0 && allPigsDead) {
		LK.showYouWin();
		return;
	}
	// If current bird stopped, move to next bird
	if (currentBird && currentBird.launched && currentBird.stopped && !isDragging && launching) {
		birdIndex++;
		updateBirdsLeft();
		if (birdIndex < birds.length) {
			currentBird = birds[birdIndex];
			// Move next bird to slingshot
			tween(currentBird, {
				x: slingshotX,
				y: slingshotY
			}, {
				duration: 300,
				easing: tween.easeOut,
				onFinish: function onFinish() {
					launching = false;
				}
			});
		} else {
			// Out of birds, game over
			LK.showGameOver();
			return;
		}
		launching = false;
	}
};
// --- Start Game ---
setupLevel();

===================================================================
--- original.js
+++ change.js
@@ -128,8 +128,69 @@
 		return dist < self.radius + other.radius;
 	};
 	return self;
 });
+// Block class with gravity and simple physics
+var Block = Container.expand(function () {
+	var self = Container.call(this);
+	// Attach block asset
+	var blockAsset = self.attachAsset('block', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	// Set width/height after attach
+	self.width = blockAsset.width;
+	self.height = blockAsset.height;
+	// Physics properties
+	self.vx = 0;
+	self.vy = 0;
+	self.gravity = 0.7;
+	self.friction = 0.98;
+	self.bounce = 0.2;
+	self.stopped = false;
+	// Called every tick
+	self.update = function () {
+		// Track lastX and lastY for physics events
+		if (typeof self.lastX === "undefined") self.lastX = self.x;
+		if (typeof self.lastY === "undefined") self.lastY = self.y;
+		if (!self.stopped) {
+			self.vy += self.gravity;
+			self.x += self.vx;
+			self.y += self.vy;
+			self.vx *= self.friction;
+			self.vy *= self.friction;
+			// Floor collision
+			if (self.y + self.height / 2 > groundY) {
+				self.y = groundY - self.height / 2;
+				if (Math.abs(self.vy) > 2) {
+					self.vy = -self.vy * self.bounce;
+					self.vx *= 0.8;
+				} else {
+					self.vy = 0;
+					self.vx *= 0.8;
+					if (Math.abs(self.vx) < 1 && Math.abs(self.vy) < 0.5) {
+						self.stopped = true;
+					} else {
+						self.stopped = false;
+					}
+				}
+			}
+			// Wall collision
+			if (self.x - self.width / 2 < 0) {
+				self.x = self.width / 2;
+				self.vx = -self.vx * self.bounce;
+			}
+			if (self.x + self.width / 2 > 2048) {
+				self.x = 2048 - self.width / 2;
+				self.vx = -self.vx * self.bounce;
+			}
+		}
+		// Update lastX and lastY after movement
+		self.lastX = self.x;
+		self.lastY = self.y;
+	};
+	return self;
+});
 // Pig class
 var Pig = Container.expand(function () {
 	var self = Container.call(this);
 	// Attach a green ellipse as the pig
@@ -394,45 +455,33 @@
 	var box2TopY = box1TopY - boxHeight - 80; // 80px gap between boxes
 	// Helper to add a box at (centerX, topY)
 	function addBox(centerX, topY) {
 		// Top horizontal block
-		var blockTop = LK.getAsset('block', {
-			anchorX: 0.5,
-			anchorY: 0.5
-		});
+		var blockTop = new Block();
 		blockTop.width = boxWidth;
 		blockTop.height = blockThickness;
 		blockTop.x = centerX;
 		blockTop.y = topY;
 		game.addChild(blockTop);
 		blocks.push(blockTop);
 		// Bottom horizontal block
-		var blockBottom = LK.getAsset('block', {
-			anchorX: 0.5,
-			anchorY: 0.5
-		});
+		var blockBottom = new Block();
 		blockBottom.width = boxWidth;
 		blockBottom.height = blockThickness;
 		blockBottom.x = centerX;
 		blockBottom.y = topY + boxHeight;
 		game.addChild(blockBottom);
 		blocks.push(blockBottom);
 		// Left vertical block
-		var blockLeft = LK.getAsset('block', {
-			anchorX: 0.5,
-			anchorY: 0.5
-		});
+		var blockLeft = new Block();
 		blockLeft.width = blockThickness;
 		blockLeft.height = boxHeight;
 		blockLeft.x = centerX - boxWidth / 2 + blockThickness / 2;
 		blockLeft.y = topY + boxHeight / 2;
 		game.addChild(blockLeft);
 		blocks.push(blockLeft);
 		// Right vertical block
-		var blockRight = LK.getAsset('block', {
-			anchorX: 0.5,
-			anchorY: 0.5
-		});
+		var blockRight = new Block();
 		blockRight.width = blockThickness;
 		blockRight.height = boxHeight;
 		blockRight.x = centerX + boxWidth / 2 - blockThickness / 2;
 		blockRight.y = topY + boxHeight / 2;
@@ -535,8 +584,14 @@
 	// Update all pigs
 	for (var i = 0; i < pigs.length; i++) {
 		pigs[i].update();
 	}
+	// Update all blocks (gravity/physics)
+	for (var i = 0; i < blocks.length; i++) {
+		if (typeof blocks[i].update === "function") {
+			blocks[i].update();
+		}
+	}
 	// Bird-pig collision
 	for (var i = 0; i < birds.length; i++) {
 		var bird = birds[i];
 		if (!bird.launched) continue;