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

/**** 
* Classes
****/ 
// Represents a placed bomb
var Bomb = Container.expand(function (col, row) {
	var self = Container.call(this);
	var graphics = self.attachAsset('bomb', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.col = col;
	self.row = row;
	self.x = getWorldCoords(col, row).x;
	self.y = getWorldCoords(col, row).y;
	self.isBomb = true; // Identifier
	self.pulsatingTween = null; // Initialize tween variable
	// Define the pulsation functions
	function scaleDown() {
		// Prevent tweening if the bomb is already destroyed
		if (self.destroyed) {
			return;
		}
		self.pulsatingTween = tween(self.scale, {
			x: 1.0,
			y: 1.0
		}, {
			duration: 200,
			ease: tween.easeInOut,
			onFinish: scaleUp // When shrinking finishes, start growing
		});
	}
	function scaleUp() {
		// Prevent tweening if the bomb is already destroyed
		if (self.destroyed) {
			return;
		}
		self.pulsatingTween = tween(self.scale, {
			x: 1.1,
			y: 1.1
		}, {
			duration: 200,
			ease: tween.easeInOut,
			onFinish: scaleDown // When growing finishes, start shrinking
		});
	}
	// Start the pulsation cycle
	scaleUp();
	// Start the explosion timer
	var explosionTimer = LK.setTimeout(function () {
		explodeBomb(self);
	}, BOMB_TIMER);
	// Public method to trigger explosion early (chain reaction)
	self.triggerExplosion = function () {
		LK.clearTimeout(explosionTimer);
		explodeBomb(self);
	};
	// Override destroy to clear the timer
	var baseDestroy = self.destroy;
	self.destroy = function () {
		LK.clearTimeout(explosionTimer);
		// Stop the specific pulsating tween instance
		if (self.pulsatingTween) {
			self.pulsatingTween.kill(); // Use the kill() method on the stored tween instance
			self.pulsatingTween = null; // Clear the reference
		}
		// Make sure the grid cell is marked empty when bomb is destroyed (e.g., by explosion)
		if (grid[self.col] && grid[self.col][self.row] === CELL_TYPE.BOMB) {
			setCell(self.col, self.row, CELL_TYPE.EMPTY);
		}
		// Remove from active bombs list in game scope
		var index = activeBombs.indexOf(self);
		if (index !== -1) {
			activeBombs.splice(index, 1);
		}
		// Mark as destroyed so ongoing tween callbacks won't try to run
		self.destroyed = true;
		if (baseDestroy) {
			baseDestroy.call(self);
		} // Call original destroy if exists
	};
	return self;
});
// Represents an enemy that moves between grid cells
var Enemy = Container.expand(function (startCol, startRow) {
	var self = Container.call(this);
	var graphics = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.col = startCol;
	self.row = startRow;
	self.isEnemy = true; // Identifier
	self.isMoving = false; // Flag to track movement animation state
	self.moveDelay = 1000 + Math.random() * 1000; // Random delay between moves
	self.lastMoveTime = Date.now(); // Track when last moved
	// Snap to initial grid position
	var initialPos = getWorldCoords(self.col, self.row);
	self.x = initialPos.x;
	self.y = initialPos.y;
	// Try to move in a random direction
	self.tryRandomMove = function () {
		if (self.isMoving) {
			return false;
		}
		// Get all possible directions: up, right, down, left
		var directions = [{
			dx: 0,
			dy: -1
		},
		// up
		{
			dx: 1,
			dy: 0
		},
		// right
		{
			dx: 0,
			dy: 1
		},
		// down
		{
			dx: -1,
			dy: 0
		} // left
		];
		// Shuffle directions for randomness
		for (var i = directions.length - 1; i > 0; i--) {
			var j = Math.floor(Math.random() * (i + 1));
			var temp = directions[i];
			directions[i] = directions[j];
			directions[j] = temp;
		}
		// Try each direction until a valid move is found
		for (var i = 0; i < directions.length; i++) {
			var newCol = self.col + directions[i].dx;
			var newRow = self.row + directions[i].dy;
			if (isWalkable(newCol, newRow)) {
				// Found valid move
				self.moveTo(newCol, newRow, directions[i].dx);
				return true;
			}
		}
		return false; // No valid moves found
	};
	// Move to a new cell
	self.moveTo = function (newCol, newRow, dx) {
		self.isMoving = true;
		self.col = newCol;
		self.row = newRow;
		var targetPos = getWorldCoords(newCol, newRow);
		// Flip sprite based on movement direction
		if (dx < 0) {
			graphics.scale.x = -1;
		} else if (dx > 0) {
			graphics.scale.x = 1;
		}
		// Animate movement
		tween(self, {
			x: targetPos.x,
			y: targetPos.y
		}, {
			duration: 200,
			onFinish: function onFinish() {
				self.isMoving = false;
				self.lastMoveTime = Date.now();
			}
		});
		return true;
	};
	return self;
});
// Spawn enemies at random empty cells
// Represents a single explosion particle/cell
var Explosion = Container.expand(function (col, row) {
	var self = Container.call(this);
	var graphics = self.attachAsset('explosion', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.col = col;
	self.row = row;
	self.x = getWorldCoords(col, row).x;
	self.y = getWorldCoords(col, row).y;
	self.isExplosion = true; // Identifier for collision checks
	// Start scaled down for explosion effect
	self.scale.set(0);
	// Animate the explosion appearing
	tween(self.scale, {
		x: 1,
		y: 1
	}, {
		duration: 150,
		ease: tween.easeOutQuad
	});
	// Fade out and destroy after duration
	var timer = LK.setTimeout(function () {
		self.destroy(); // Destroy handled by Game update loop removal
	}, EXPLOSION_DURATION);
	// Override destroy to clear the timer
	var baseDestroy = self.destroy;
	self.destroy = function () {
		LK.clearTimeout(timer);
		if (baseDestroy) {
			baseDestroy.call(self);
		} // Call original destroy if exists
	};
	return self;
});
// Represents the player character
var Player = Container.expand(function (startCol, startRow) {
	var self = Container.call(this);
	var graphics = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.col = startCol;
	self.row = startRow;
	self.isPlayer = true; // Identifier
	// Snap to initial grid position
	var initialPos = getWorldCoords(self.col, self.row);
	self.x = initialPos.x;
	self.y = initialPos.y;
	self.isMoving = false; // Flag to track movement animation state
	// Empty placeholder for movement - functionality removed
	self.moveTo = function (newCol, newRow) {
		// Movement functionality removed
		return false; // Movement disabled
	};
	// Empty placeholder for bomb placement - functionality removed
	self.placeBomb = function () {
		// Bomb placement functionality removed
	};
});
// Represents a power-up item dropped on the grid
var PowerUp = Container.expand(function (col, row, type) {
	var self = Container.call(this);
	self.col = col;
	self.row = row;
	self.type = type; // 'extra_bomb' or 'bigger_explosion'
	self.isPowerUp = true; // Identifier
	var assetId = type === 'extra_bomb' ? 'powerup_bomb' : 'powerup_range';
	var graphics = self.attachAsset(assetId, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var coords = getWorldCoords(col, row);
	self.x = coords.x;
	self.y = coords.y;
	// Simple bobbing animation
	var startY = self.y;
	var bobTween;
	function bobUp() {
		if (self.destroyed) {
			return;
		}
		bobTween = tween(self, {
			y: startY - 10
		}, {
			duration: 500,
			ease: tween.easeInOutSine,
			onFinish: bobDown
		});
	}
	function bobDown() {
		if (self.destroyed) {
			return;
		}
		bobTween = tween(self, {
			y: startY
		}, {
			duration: 500,
			ease: tween.easeInOutSine,
			onFinish: bobUp
		});
	}
	bobUp(); // Start animation
	// Override destroy to stop tween
	var baseDestroy = self.destroy;
	self.destroy = function () {
		self.destroyed = true; // Flag to stop tween callbacks
		if (bobTween) {
			bobTween.kill();
			bobTween = null;
		}
		// Remove from active power-ups list
		var index = activePowerUps.indexOf(self);
		if (index !== -1) {
			activePowerUps.splice(index, 1);
		}
		if (baseDestroy) {
			baseDestroy.call(self);
		}
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0xaaaaaa // Light gray background
});

/**** 
* Game Code
****/ 
// Placeholder ID
// Placeholder ID
// --- Constants ---
// Engine will implicitly create assets based on usage below.
// Let's define the shapes we'll use:
var GRID_COLS = 15; // Ensure odd number for wall placement
var GRID_ROWS = 21; // Ensure odd number for wall placement
var CELL_SIZE = 128;
var GRID_WIDTH = GRID_COLS * CELL_SIZE;
var GRID_HEIGHT = GRID_ROWS * CELL_SIZE;
var GRID_OFFSET_X = (2048 - GRID_WIDTH) / 2;
var GRID_OFFSET_Y = (2732 - GRID_HEIGHT) / 2 + 50; // Adjust Y offset slightly down
var CELL_TYPE = {
	EMPTY: 0,
	DESTRUCTIBLE: 1,
	INDESTRUCTIBLE: 2,
	BOMB: 3,
	// Cell temporarily occupied by a bomb
	EXPLOSION: 4 // Cell temporarily occupied by explosion
};
var BOMB_TIMER = 2500; // Milliseconds before bomb explodes
var EXPLOSION_DURATION = 400; // Milliseconds explosion visuals last
var BASE_BOMB_RANGE = 2; // Default explosion range
var BASE_MAX_BOMBS = 1; // Default max bombs
var BOMB_RANGE; // Current explosion range (can be modified by powerups)
var MAX_BOMBS; // Current max bombs (can be modified by powerups)
var POWERUP_CHANCE = 0.3; // 30% chance to drop a powerup from a brick
var BRICK_DENSITY = 0.4; // Reduced probability of a potential spot having a brick to make room for enemies
// --- Game State Variables ---
var grid = []; // 2D array holding CELL_TYPE for each cell
var gridSprites = []; // 2D array holding visual sprites for walls/bricks
var player;
var activeBombs = [];
var activeExplosions = []; // Array to hold active Explosion objects
var enemies = []; // Array to hold all enemy instances
var score = 0;
var scoreTxt;
var isGameOver = false;
var ENEMY_COUNT = 3; // Number of enemies to spawn
// --- Helper Functions ---
// Convert grid cell indices to world coordinates (center of the cell)
function getWorldCoords(col, row) {
	var x = GRID_OFFSET_X + col * CELL_SIZE + CELL_SIZE / 2;
	var y = GRID_OFFSET_Y + row * CELL_SIZE + CELL_SIZE / 2;
	return {
		x: x,
		y: y
	};
}
// Get the type of a cell, handling out-of-bounds
function getCellType(col, row) {
	if (col < 0 || col >= GRID_COLS || row < 0 || row >= GRID_ROWS) {
		return CELL_TYPE.INDESTRUCTIBLE; // Treat out of bounds as walls
	}
	return grid[col][row];
}
// Set the type of a cell
function setCell(col, row, type) {
	if (col >= 0 && col < GRID_COLS && row >= 0 && row < GRID_ROWS) {
		grid[col][row] = type;
	}
}
// Check if a cell is valid and empty for movement
function isWalkable(col, row) {
	var cellType = getCellType(col, row);
	// A cell is walkable only if it's currently empty. Player cannot initiate move into other tiles.
	return cellType === CELL_TYPE.EMPTY;
}
// --- Grid Generation ---
function generateGrid() {
	grid = [];
	gridSprites = [];
	// Clear previous sprites if any
	game.children.forEach(function (child) {
		if (child.isGridElement) {
			// Add a flag to identify grid sprites
			child.destroy();
		}
	});
	game.removeChildren(); // Clear all children before regenerating
	// Add floor tiles everywhere first
	for (var c = 0; c < GRID_COLS; c++) {
		for (var r = 0; r < GRID_ROWS; r++) {
			var floorTile = LK.getAsset('floor', {
				anchorX: 0.0,
				anchorY: 0.0
			});
			floorTile.x = GRID_OFFSET_X + c * CELL_SIZE;
			floorTile.y = GRID_OFFSET_Y + r * CELL_SIZE;
			floorTile.isGridElement = true;
			game.addChild(floorTile);
		}
	}
	for (var c = 0; c < GRID_COLS; c++) {
		grid[c] = [];
		gridSprites[c] = [];
		for (var r = 0; r < GRID_ROWS; r++) {
			var cellType;
			var sprite = null;
			// Place indestructible walls around border and in a checkerboard pattern inside
			if (c === 0 || c === GRID_COLS - 1 || r === 0 || r === GRID_ROWS - 1 || c % 2 === 0 && r % 2 === 0) {
				cellType = CELL_TYPE.INDESTRUCTIBLE;
				sprite = LK.getAsset('wall', {
					anchorX: 0.0,
					anchorY: 0.0
				});
			} else {
				// Place destructible bricks randomly, ensuring player start area is clear
				if (c <= 2 && r <= 2 || c >= GRID_COLS - 3 && r >= GRID_ROWS - 3) {
					// Clear corners for potential spawns
					cellType = CELL_TYPE.EMPTY;
				} else if (Math.random() < BRICK_DENSITY) {
					cellType = CELL_TYPE.DESTRUCTIBLE;
					sprite = LK.getAsset('brick', {
						anchorX: 0.0,
						anchorY: 0.0
					});
				} else {
					cellType = CELL_TYPE.EMPTY;
				}
			}
			grid[c][r] = cellType;
			if (sprite) {
				sprite.x = GRID_OFFSET_X + c * CELL_SIZE;
				sprite.y = GRID_OFFSET_Y + r * CELL_SIZE;
				sprite.isGridElement = true; // Mark as part of the grid visuals
				game.addChild(sprite);
				gridSprites[c][r] = sprite;
			} else {
				gridSprites[c][r] = null;
			}
		}
	}
	// Ensure player start is clear
	setCell(1, 1, CELL_TYPE.EMPTY);
	setCell(1, 2, CELL_TYPE.EMPTY);
	setCell(2, 1, CELL_TYPE.EMPTY);
	if (gridSprites[1] && gridSprites[1][1]) {
		var _gridSprites$1$;
		(_gridSprites$1$ = gridSprites[1][1]) === null || _gridSprites$1$ === void 0 || _gridSprites$1$.destroy();
		gridSprites[1][1] = null;
	}
	if (gridSprites[1] && gridSprites[1][2]) {
		var _gridSprites$1$2;
		(_gridSprites$1$2 = gridSprites[1][2]) === null || _gridSprites$1$2 === void 0 || _gridSprites$1$2.destroy();
		gridSprites[1][2] = null;
	}
	if (gridSprites[2] && gridSprites[2][1]) {
		var _gridSprites$2$;
		(_gridSprites$2$ = gridSprites[2][1]) === null || _gridSprites$2$ === void 0 || _gridSprites$2$.destroy();
		gridSprites[2][1] = null;
	}
}
// --- Explosion Handling ---
function createExplosion(col, row) {
	if (col < 0 || col >= GRID_COLS || row < 0 || row >= GRID_ROWS) {
		return false;
	} // Out of bounds
	var cellType = getCellType(col, row);
	if (cellType === CELL_TYPE.INDESTRUCTIBLE) {
		return false; // Explosion stops at indestructible walls
	}
	// Create visual explosion part
	var explosionPart = new Explosion(col, row);
	game.addChild(explosionPart);
	activeExplosions.push(explosionPart);
	setCell(col, row, CELL_TYPE.EXPLOSION); // Mark cell as exploding
	// Check for chain reactions or destroying bricks
	if (cellType === CELL_TYPE.DESTRUCTIBLE) {
		var brickSprite = gridSprites[col][row];
		if (brickSprite) {
			brickSprite.destroy();
			gridSprites[col][row] = null;
		}
		// Chance to spawn a power-up
		if (Math.random() < POWERUP_CHANCE) {
			var powerUpType = Math.random() < 0.5 ? 'extra_bomb' : 'bigger_explosion';
			var newPowerUp = new PowerUp(col, row, powerUpType);
			activePowerUps.push(newPowerUp);
			// Add powerup slightly above floor, but below other dynamic elements
			// Find the index of the player to insert before it, otherwise add to end (simplistic layering)
			var playerIndex = game.children.indexOf(player);
			if (playerIndex !== -1) {
				game.addChildAt(newPowerUp, playerIndex);
			} else {
				game.addChild(newPowerUp);
			}
		} else {
			// Only set to empty if no powerup spawned here
			setCell(col, row, CELL_TYPE.EMPTY); // Brick destroyed, becomes empty
		}
		setCell(col, row, CELL_TYPE.EXPLOSION); // Temporarily becomes explosion regardless of powerup spawn
		LK.getSound('destroy_brick').play();
		LK.setScore(LK.getScore() + 10); // Award score for destroying brick
		scoreTxt.setText(LK.getScore());
		return false; // Explosion stops after destroying a brick
	} else if (cellType === CELL_TYPE.BOMB) {
		// Find the bomb object at this location and trigger it
		var bombToTrigger = null;
		for (var i = 0; i < activeBombs.length; i++) {
			if (activeBombs[i].col === col && activeBombs[i].row === row) {
				bombToTrigger = activeBombs[i];
				break;
			}
		}
		if (bombToTrigger && !bombToTrigger.isExploding) {
			// Prevent infinite loops if already triggered
			bombToTrigger.isExploding = true; // Mark as exploding to avoid re-triggering
			bombToTrigger.triggerExplosion();
		}
		return false; // Chain reaction handles further explosion; stop this particular ray
	}
	return true; // Explosion continues
}
function explodeBomb(bomb) {
	if (!bomb || bomb.destroyed) {
		return;
	} // Bomb might already be destroyed by chain reaction
	LK.getSound('explosion_sound').play();
	var centerCol = bomb.col;
	var centerRow = bomb.row;
	// Remove bomb object itself first to prevent chain reaction with self
	bomb.destroy(); // This also removes from activeBombs and sets cell to EMPTY
	// Create explosion at the center
	createExplosion(centerCol, centerRow);
	// Create explosions outwards in four directions
	var directions = [[0, 1], [0, -1], [1, 0], [-1, 0]]; // Down, Up, Right, Left
	for (var i = 0; i < directions.length; i++) {
		var dx = directions[i][0];
		var dy = directions[i][1];
		for (var r = 1; r <= BOMB_RANGE; r++) {
			var currentC = centerCol + dx * r;
			var currentR = centerRow + dy * r;
			if (!createExplosion(currentC, currentR)) {
				break; // Stop this direction if explosion is blocked
			}
		}
	}
}
// --- Game Initialization ---
function initGame() {
	isGameOver = false;
	score = 0;
	LK.setScore(0);
	activeBombs = [];
	activeExplosions = [];
	activePowerUps = []; // Reset active powerups
	enemies = [];
	MAX_BOMBS = BASE_MAX_BOMBS; // Reset max bombs
	BOMB_RANGE = BASE_BOMB_RANGE; // Reset bomb range
	generateGrid();
	// Create Player
	player = new Player(1, 1); // Start at top-left clear area
	game.addChild(player);
	// Spawn enemies on empty cells
	spawnEnemies();
	// Score Display
	scoreTxt = new Text2('0', {
		size: 80,
		fill: 0xFFFFFF
	});
	scoreTxt.anchor.set(0.5, 0);
	LK.gui.top.addChild(scoreTxt); // Add score to top center UI
}
// --- Event Handlers ---
// Handle player movement and bomb placement based on click/tap position
game.down = function (x, y, obj) {
	if (isGameOver || player.isMoving) {
		return;
	}
	// Get click position relative to the game area
	var clickGameX = x;
	var clickGameY = y;
	// Determine the target grid cell based on click position
	var targetCol = Math.floor((clickGameX - GRID_OFFSET_X) / CELL_SIZE);
	var targetRow = Math.floor((clickGameY - GRID_OFFSET_Y) / CELL_SIZE);
	// Ensure target is within grid bounds
	if (targetCol < 0 || targetCol >= GRID_COLS || targetRow < 0 || targetRow >= GRID_ROWS) {
		return; // Click outside the grid
	}
	// Check if the clicked cell is the player's current cell
	if (targetCol === player.col && targetRow === player.row) {
		// Clicked on player's cell, place a bomb if possible
		if (activeBombs.length < MAX_BOMBS && getCellType(player.col, player.row) !== CELL_TYPE.BOMB) {
			var newBomb = new Bomb(player.col, player.row);
			game.addChild(newBomb);
			activeBombs.push(newBomb);
			setCell(player.col, player.row, CELL_TYPE.BOMB);
		}
	} else {
		// Clicked on a different cell, attempt to move
		var dx = targetCol - player.col;
		var dy = targetRow - player.row;
		// Determine direction of movement based on the larger difference
		if (Math.abs(dx) > Math.abs(dy)) {
			// Horizontal movement
			if (dx > 0) {
				// Move Right
				if (isWalkable(player.col + 1, player.row)) {
					player.col++;
					player.isMoving = true;
				}
			} else {
				// Move Left
				if (isWalkable(player.col - 1, player.row)) {
					player.col--;
					player.isMoving = true;
				}
			}
		} else {
			// Vertical movement
			if (dy > 0) {
				// Move Down
				if (isWalkable(player.col, player.row + 1)) {
					player.row++;
					player.isMoving = true;
				}
			} else {
				// Move Up
				if (isWalkable(player.col, player.row - 1)) {
					player.row--;
					player.isMoving = true;
				}
			}
		}
		// If player is moving, tween the position
		if (player.isMoving) {
			var targetPos = getWorldCoords(player.col, player.row);
			// Mirror the player graphic if moving left
			if (dx < 0) {
				player.children[0].scale.x = -1;
			} else if (dx > 0) {
				// Un-mirror if moving right
				player.children[0].scale.x = 1;
			}
			tween(player, {
				x: targetPos.x,
				y: targetPos.y
			}, {
				duration: 150,
				onFinish: function onFinish() {
					player.isMoving = false;
				}
			});
		}
	}
};
// --- Game Update Loop ---
game.update = function () {
	if (isGameOver) {
		return;
	}
	// Check for player collision with explosions
	var playerCol = player.col;
	var playerRow = player.row;
	if (getCellType(playerCol, playerRow) === CELL_TYPE.EXPLOSION) {
		LK.getSound('player_die').play();
		LK.effects.flashObject(player, 0xff0000, 300); // Flash player red
		isGameOver = true;
		LK.setTimeout(function () {
			LK.showGameOver(); // Show game over screen after a short delay
		}, 500);
		return; // Stop further updates after game over
	}
	// Check for player collision with enemies
	for (var i = 0; i < enemies.length; i++) {
		var enemy = enemies[i];
		if (enemy.col === playerCol && enemy.row === playerRow) {
			LK.getSound('player_die').play();
			LK.effects.flashObject(player, 0xff0000, 300); // Flash player red
			isGameOver = true;
			LK.setTimeout(function () {
				LK.showGameOver(); // Show game over screen after a short delay
			}, 500);
			return; // Stop further updates after game over
		}
		// Check for player collision with powerups
		for (var p = activePowerUps.length - 1; p >= 0; p--) {
			// Ensure powerUp is valid before accessing properties
			if (!activePowerUps[p]) {
				continue;
			}
			var powerUp = activePowerUps[p];
			if (powerUp.col === playerCol && powerUp.row === playerRow) {
				// Player picked up powerup
				if (powerUp.type === 'extra_bomb') {
					MAX_BOMBS++;
				} else if (powerUp.type === 'bigger_explosion') {
					BOMB_RANGE++;
				}
				LK.getSound('powerup_pickup').play();
				// Cell should already be EMPTY, but ensure consistency
				setCell(powerUp.col, powerUp.row, CELL_TYPE.EMPTY);
				powerUp.destroy(); // Handles removal from array and visual stage. This also splices activePowerUps.
				// No need to adjust loop index `p` because destroy() splices the array we are iterating backward.
			}
		}
		// Powerups are no longer destroyed by explosions upon spawning.
		// Check for enemy collision with explosions
		if (getCellType(enemy.col, enemy.row) === CELL_TYPE.EXPLOSION) {
			// Enemy hit by explosion
			LK.effects.flashObject(enemy, 0xffff00, 200);
			enemy.destroy();
			enemies.splice(i, 1);
			// Add score for killing enemy
			LK.setScore(LK.getScore() + 50);
			scoreTxt.setText(LK.getScore());
			i--; // Adjust index after removing element
		}
	}
	// Move enemies randomly with their individual timing
	var now = Date.now();
	for (var i = 0; i < enemies.length; i++) {
		var enemy = enemies[i];
		if (!enemy.isMoving && now - enemy.lastMoveTime > enemy.moveDelay) {
			enemy.tryRandomMove();
		}
	}
	// Clean up finished explosions and reset cell types
	for (var i = activeExplosions.length - 1; i >= 0; i--) {
		var explosion = activeExplosions[i];
		// Check if the explosion sprite itself has been destroyed (by its internal timer)
		// Accessing internal properties like `_destroyed` is generally discouraged,
		// but necessary if the destroy mechanism is purely timer-based without explicit flags.
		// A better approach would be for Explosion class to set a 'finished' flag.
		// Let's assume Explosion.destroy correctly removes it from the stage.
		// We need a reliable way to know when to remove from activeExplosions and reset the grid cell.
		// We'll check if it's still parented to the game stage as a proxy.
		if (!explosion.parent) {
			// If it's been removed from the stage (destroyed by its timer)
			var exCol = explosion.col;
			var exRow = explosion.row;
			// Reset the grid cell to EMPTY once the explosion effect finishes.
			// Powerups visually occupy the cell but the underlying grid state should be walkable.
			if (getCellType(exCol, exRow) === CELL_TYPE.EXPLOSION) {
				setCell(exCol, exRow, CELL_TYPE.EMPTY);
			}
			activeExplosions.splice(i, 1); // Remove from active list
		}
	}
	// Win condition: all enemies destroyed and no bricks remaining
	if (enemies.length === 0) {
		var bricksRemaining = false;
		for (var c = 0; c < GRID_COLS; c++) {
			for (var r = 0; r < GRID_ROWS; r++) {
				if (getCellType(c, r) === CELL_TYPE.DESTRUCTIBLE) {
					bricksRemaining = true;
					break;
				}
			}
			if (bricksRemaining) {
				break;
			}
		}
		if (!bricksRemaining) {
			LK.showYouWin();
		}
	}
};
// --- Start the Game ---
initGame();
// Spawn enemies at random empty cells
function spawnEnemies() {
	// Clear any existing enemies
	for (var i = enemies.length - 1; i >= 0; i--) {
		enemies[i].destroy();
	}
	enemies = [];
	// Find all empty cells
	var emptyCells = [];
	for (var c = 0; c < GRID_COLS; c++) {
		for (var r = 0; r < GRID_ROWS; r++) {
			// Don't spawn near player start position
			if (getCellType(c, r) === CELL_TYPE.EMPTY && !(c <= 3 && r <= 3)) {
				// Avoid player's starting area
				emptyCells.push({
					col: c,
					row: r
				});
			}
		}
	}
	// Shuffle empty cells
	for (var i = emptyCells.length - 1; i > 0; i--) {
		var j = Math.floor(Math.random() * (i + 1));
		var temp = emptyCells[i];
		emptyCells[i] = emptyCells[j];
		emptyCells[j] = temp;
	}
	// Create enemies
	var enemiesToSpawn = Math.min(ENEMY_COUNT, emptyCells.length);
	for (var i = 0; i < enemiesToSpawn; i++) {
		var enemyCell = emptyCells[i];
		var enemy = new Enemy(enemyCell.col, enemyCell.row);
		enemies.push(enemy);
		game.addChild(enemy);
	}
}

===================================================================
--- original.js
+++ change.js
@@ -686,8 +686,12 @@
 			return; // Stop further updates after game over
 		}
 		// Check for player collision with powerups
 		for (var p = activePowerUps.length - 1; p >= 0; p--) {
+			// Ensure powerUp is valid before accessing properties
+			if (!activePowerUps[p]) {
+				continue;
+			}
 			var powerUp = activePowerUps[p];
 			if (powerUp.col === playerCol && powerUp.row === playerRow) {
 				// Player picked up powerup
 				if (powerUp.type === 'extra_bomb') {
@@ -695,12 +699,12 @@
 				} else if (powerUp.type === 'bigger_explosion') {
 					BOMB_RANGE++;
 				}
 				LK.getSound('powerup_pickup').play();
-				// Set cell to empty now that powerup is picked up
+				// Cell should already be EMPTY, but ensure consistency
 				setCell(powerUp.col, powerUp.row, CELL_TYPE.EMPTY);
-				powerUp.destroy(); // Handles removal from array and visual stage
-				// No need to adjust loop index `p` because destroy splices it
+				powerUp.destroy(); // Handles removal from array and visual stage. This also splices activePowerUps.
+				// No need to adjust loop index `p` because destroy() splices the array we are iterating backward.
 			}
 		}
 		// Powerups are no longer destroyed by explosions upon spawning.
 		// Check for enemy collision with explosions
@@ -736,18 +740,11 @@
 		if (!explosion.parent) {
 			// If it's been removed from the stage (destroyed by its timer)
 			var exCol = explosion.col;
 			var exRow = explosion.row;
-			// Reset the grid cell only if it's still marked as EXPLOSION
-			// Check if a powerup exists at this location before setting to EMPTY
-			var powerUpExists = false;
-			for (var p = 0; p < activePowerUps.length; p++) {
-				if (activePowerUps[p].col === exCol && activePowerUps[p].row === exRow) {
-					powerUpExists = true;
-					break;
-				}
-			}
-			if (getCellType(exCol, exRow) === CELL_TYPE.EXPLOSION && !powerUpExists) {
+			// Reset the grid cell to EMPTY once the explosion effect finishes.
+			// Powerups visually occupy the cell but the underlying grid state should be walkable.
+			if (getCellType(exCol, exRow) === CELL_TYPE.EXPLOSION) {
 				setCell(exCol, exRow, CELL_TYPE.EMPTY);
 			}
 			activeExplosions.splice(i, 1); // Remove from active list
 		}