/**** 
* Classes
****/ 
// DebugCell class
var DebugCell = Container.expand(function () {
	var self = Container.call(this);
	var cellGraphics = self.attachAsset('cell', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	cellGraphics.tint = Math.random() * 0xffffff;
	// Add a debug arrow to the debug cells
	var debugArrows = [];
	// Add a number label to the debug cells
	var numberLabel = new Text2('0', {
		size: 30,
		fill: 0xFFFFFF,
		weight: 800
	});
	numberLabel.anchor.set(.5, .5);
	self.addChild(numberLabel);
	self.update = function () {};
	self.down = function () {
		if (self.cell.type == 0 || self.cell.type == 1) {
			self.cell.type = self.cell.type == 1 ? 0 : 1;
			if (grid.pathFind()) {
				self.cell.type = self.cell.type == 1 ? 0 : 1;
				grid.pathFind();
				var notification = game.addChild(new Notification("Path is blocked!"));
				notification.x = 2048 / 2;
				notification.y = grid.height - 50;
			}
			grid.renderDebug();
		}
	};
	self.removeArrows = function () {
		while (debugArrows.length) {
			self.removeChild(debugArrows.pop());
		}
	};
	self.render = function (data) {
		switch (data.type) {
			case 0:
			case 2:
				{
					if (data.pathId != pathId) {
						self.removeArrows();
						numberLabel.setText("-");
						cellGraphics.tint = 0x880000;
						return;
					}
					numberLabel.visible = true;
					var tint = Math.floor(data.score / maxScore * 0x88);
					cellGraphics.tint = 0x88 - tint << 8 | tint;
					while (debugArrows.length > data.targets.length) {
						self.removeChild(debugArrows.pop());
					}
					for (var a = 0; a < data.targets.length; a++) {
						var destination = data.targets[a];
						var ox = destination.x - data.x;
						var oy = destination.y - data.y;
						var angle = Math.atan2(oy, ox);
						if (!debugArrows[a]) {
							debugArrows[a] = LK.getAsset('arrow', {
								anchorX: -.5,
								anchorY: 0.5
							});
							debugArrows[a].alpha = .5;
							self.addChildAt(debugArrows[a], 1);
							//							debugArrows = 
						}
						debugArrows[a].rotation = angle;
						//	debugArrow.rotation = angle;
					}
					break;
				}
			case 1:
				{
					self.removeArrows();
					cellGraphics.tint = 0xaaaaaa;
					numberLabel.visible = false;
					break;
				}
			case 3:
				{
					self.removeArrows();
					cellGraphics.tint = 0x008800;
					numberLabel.visible = false;
					break;
				}
		}
		numberLabel.setText(Math.floor(data.score / 1000) / 10);
	};
});
// Enemy class
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = Math.random() * .2 + .03;
	self.cellX = 0;
	self.cellY = 0;
	self.currentCellX = 0;
	self.currentCellY = 0;
	self.currentTarget = undefined;
	// Add health bar to the enemy
	var healthBarOutline = self.attachAsset('healthBarOutline', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var healthBar = self.attachAsset('healthBar', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	healthBarOutline.y = healthBar.y = -enemyGraphics.height / 2 - 10; // Position the health bar above the enemy
	self.healthBar = healthBar;
});
//Class for the grid, handles all logic related to grid movement and interaction
var Grid = Container.expand(function (gridWidth, gridHeight) {
	var self = Container.call(this);
	self.cells = [];
	self.spawns = [];
	self.goals = [];
	for (var i = 0; i < gridWidth; i++) {
		self.cells[i] = [];
		for (var j = 0; j < gridHeight; j++) {
			self.cells[i][j] = {
				score: 0,
				pathId: 0
			};
		}
	}
	/*
				Cell Types
				0: Transparent floor
				1: Wall
				2: Spawn
				3: Goal
	*/
	for (var i = 0; i < gridWidth; i++) {
		for (var j = 0; j < gridHeight; j++) {
			var debugCell = new DebugCell();
			// Set the type to 1 (wall) if the cell is on the edge of the grid, otherwise set it to 0 (ground)
			var cell = self.cells[i][j];
			var cellType = i === 0 || i >= gridWidth - 2 || j <= 1 || j === gridHeight - 1 ? 1 : 0;
			if (i > 11 - 3 && i <= 11 + 4) {
				if (j === 0) {
					cellType = 2;
					self.spawns.push(cell);
				} else if (j === gridHeight - 1) {
					cellType = 3;
					self.goals.push(cell);
				}
			}
			cell.type = cellType;
			cell.debugCell = debugCell;
			cell.x = i;
			cell.y = j;
			/*if (cell.type == 0) {
				if (Math.random() > .5) {
					cell.type = 1;
				}
			}*/
			//Cache neighbours for speed
			cell.upLeft = self.cells[i - 1] && self.cells[i - 1][j - 1];
			cell.up = self.cells[i - 1] && self.cells[i - 1][j];
			cell.upRight = self.cells[i - 1] && self.cells[i - 1][j + 1];
			cell.left = self.cells[i][j - 1];
			cell.right = self.cells[i][j + 1];
			cell.downLeft = self.cells[i + 1] && self.cells[i + 1][j - 1];
			cell.down = self.cells[i + 1] && self.cells[i + 1][j];
			cell.downRight = self.cells[i + 1] && self.cells[i + 1][j + 1];
			cell.neighbors = [cell.upLeft, cell.up, cell.upRight, cell.right, cell.downRight, cell.down, cell.downLeft, cell.left];
			cell.targets = [];
			self.addChild(debugCell);
			debugCell.cell = cell;
			debugCell.x = i * 76;
			debugCell.y = j * 76;
		}
	}
	self.getCell = function (x, y) {
		return self.cells[x] && self.cells[x][y];
	};
	self.pathFind = function () {
		var before = new Date().getTime();
		var toProcess = self.goals.concat([]);
		maxScore = 0;
		pathId += 1;
		for (var a = 0; a < toProcess.length; a++) {
			toProcess[a].pathId = pathId;
		}
		function processNode(node, targetValue, targetNode) {
			if (node && node.type != 1) {
				if (node.pathId < pathId || targetValue < node.score) {
					node.targets = [targetNode];
				} else if (node.pathId == pathId && targetValue == node.score) {
					node.targets.push(targetNode);
				}
				if (node.pathId < pathId || targetValue < node.score) {
					node.score = targetValue;
					if (node.pathId != pathId) {
						toProcess.push(node);
					}
					node.pathId = pathId;
					if (targetValue > maxScore) {
						maxScore = targetValue;
					}
				}
			}
		}
		while (toProcess.length) {
			var nodes = toProcess;
			toProcess = [];
			for (var a = 0; a < nodes.length; a++) {
				var node = nodes[a];
				var targetScore = node.score + 14142;
				processNode(node.upLeft, targetScore, node);
				processNode(node.upRight, targetScore, node);
				processNode(node.downRight, targetScore, node);
				processNode(node.downLeft, targetScore, node);
				targetScore = node.score + 10000;
				processNode(node.up, targetScore, node);
				processNode(node.right, targetScore, node);
				processNode(node.down, targetScore, node);
				processNode(node.left, targetScore, node);
			}
		}
		for (var a = 0; a < self.spawns.length; a++) {
			if (self.spawns[a].pathId != pathId) {
				console.warn("Spawn blocked");
				return true;
			}
		}
		for (var a = 0; a < enemies.length; a++) {
			var enemy = enemies[a];
			var target = self.getCell(enemy.cellX, enemy.cellY);
			if (enemy.currentTarget) {
				if (enemy.currentTarget.pathId != pathId) {
					if (!target || target.pathId != pathId) {
						console.warn("Enemy blocked");
						return true;
					}
				}
			} else if (!target || target.pathId != pathId) {
				console.warn("Enemy blocked");
				return true;
			}
		}
		console.log("Speed", new Date().getTime() - before);
	};
	self.renderDebug = function () {
		for (var i = 0; i < gridWidth; i++) {
			for (var j = 0; j < gridHeight; j++) {
				var debugCell = self.cells[i][j].debugCell;
				debugCell.render(self.cells[i][j]);
			}
		}
	};
	self.updateEnemy = function (enemy) {
		var cell = grid.getCell(enemy.cellX, enemy.cellY);
		if (cell.type == 3) {
			return true;
		}
		if (!enemy.currentTarget) {
			enemy.currentTarget = cell.targets[0];
		}
		if (enemy.currentTarget) {
			//Allows enemies to change direction right away.
			if (cell.score < enemy.currentTarget.score) {
				enemy.currentTarget = cell;
			}
			var ox = enemy.currentTarget.x - enemy.currentCellX;
			var oy = enemy.currentTarget.y - enemy.currentCellY;
			var dist = Math.sqrt(ox * ox + oy * oy);
			if (dist < enemy.speed) {
				enemy.cellX = Math.round(enemy.currentCellX);
				enemy.cellY = Math.round(enemy.currentCellY);
				enemy.currentTarget = undefined;
				return;
			}
			var angle = Math.atan2(oy, ox);
			enemy.currentCellX += Math.cos(angle) * enemy.speed;
			enemy.currentCellY += Math.sin(angle) * enemy.speed;
		}
		enemy.x = enemy.currentCellX * 75;
		enemy.y = enemy.currentCellY * 75;
	};
});
// Notification class
var Notification = Container.expand(function (message) {
	var self = Container.call(this);
	var notificationGraphics = self.attachAsset('notification', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var notificationText = new Text2(message, {
		size: 50,
		fill: 0x000000,
		weight: 800
	});
	notificationText.anchor.set(0.5, 0.5);
	notificationGraphics.width = notificationText.width + 30;
	self.addChild(notificationText);
	self.alpha = 1;
	var fadeOutTime = 120; // 2 seconds at 60FPS
	self.update = function () {
		if (fadeOutTime > 0) {
			fadeOutTime--;
			self.alpha = Math.min(fadeOutTime / 120 * 2, 1);
		} else {
			self.destroy();
		}
	};
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x333333 //Init game with black background 
});

/**** 
* Game Code
****/ 
var pathId = 1;
var maxScore = 0;
var enemies = [];
var defenses = [];
var grid = new Grid(25, 29);
grid.x = 112;
grid.y = 112;
grid.pathFind();
grid.renderDebug();
game.addChild(grid);
var offset = 0;
game.update = function () {
	if (++offset % 100 == 0) {
		isFirst = false;
		var target = grid.spawns[Math.random() * grid.spawns.length >> 0];
		var enemy = grid.addChild(new Enemy());
		enemy.currentCellX = enemy.cellX = target.x;
		enemy.currentCellY = enemy.cellY = target.y;
		enemies.push(enemy);
	}
	for (var a = enemies.length - 1; a >= 0; a--) {
		if (grid.updateEnemy(enemies[a])) {
			grid.removeChild(enemies[a]);
			enemies.splice(a--, 1);
		}
	}
};

===================================================================
--- original.js
+++ change.js
@@ -131,15 +131,22 @@
 				pathId: 0
 			};
 		}
 	}
+	/*
+				Cell Types
+				0: Transparent floor
+				1: Wall
+				2: Spawn
+				3: Goal
+	*/
 	for (var i = 0; i < gridWidth; i++) {
 		for (var j = 0; j < gridHeight; j++) {
 			var debugCell = new DebugCell();
 			// Set the type to 1 (wall) if the cell is on the edge of the grid, otherwise set it to 0 (ground)
 			var cell = self.cells[i][j];
-			var cellType = i === 0 || i === gridWidth - 1 || j === 0 || j === gridHeight - 1 ? 1 : 0;
-			if (i > 11 - 3 && i <= 11 + 3) {
+			var cellType = i === 0 || i >= gridWidth - 2 || j <= 1 || j === gridHeight - 1 ? 1 : 0;
+			if (i > 11 - 3 && i <= 11 + 4) {
 				if (j === 0) {
 					cellType = 2;
 					self.spawns.push(cell);
 				} else if (j === gridHeight - 1) {
@@ -168,10 +175,10 @@
 			cell.neighbors = [cell.upLeft, cell.up, cell.upRight, cell.right, cell.downRight, cell.down, cell.downLeft, cell.left];
 			cell.targets = [];
 			self.addChild(debugCell);
 			debugCell.cell = cell;
-			debugCell.x = i * 75;
-			debugCell.y = j * 75;
+			debugCell.x = i * 76;
+			debugCell.y = j * 76;
 		}
 	}
 	self.getCell = function (x, y) {
 		return self.cells[x] && self.cells[x][y];
@@ -306,11 +313,8 @@
 			self.destroy();
 		}
 	};
 });
-var Tower = Container.expand(function (type) {
-	var self = Container.call(this);
-});
 
 /**** 
 * Initialize Game
 ****/ 
@@ -324,11 +328,11 @@
 var pathId = 1;
 var maxScore = 0;
 var enemies = [];
 var defenses = [];
-var grid = new Grid(24, 28);
-grid.x = 160;
-grid.y = 150;
+var grid = new Grid(25, 29);
+grid.x = 112;
+grid.y = 112;
 grid.pathFind();
 grid.renderDebug();
 game.addChild(grid);
 var offset = 0;