===================================================================
--- original.js
+++ change.js
@@ -1,7 +1,7 @@
-var Tower = Container.expand(function () {
+var Plain = Container.expand(function () {
 	var self = Container.call(this);
-	var towerGraphics = self.createAsset('tower', 'Tower Graphics', .5, .5);
+	var plainGraphics = self.createAsset('plain', 'Plain Graphics', .5, .5);
 	self.shoot = function () {};
 });
 var Enemy = Container.expand(function () {
 	var self = Container.call(this);
@@ -15,16 +15,16 @@
 });
 var Game = Container.expand(function () {
 	var self = Container.call(this);
 	LK.stageContainer.setBackgroundColor(0xFFFFFF);
-	var towers = [];
+	var plains = [];
 	var enemies = [];
 	var bullets = [];
 	for (var i = 0; i < 5; i++) {
-		var tower = new Tower();
+		var plain = new Plain();
 		tower.x = 2048 / 2 + i * 100;
 		tower.y = 2732 / 2;
-		towers.push(tower);
+		plains.push(plain);
 		self.addChild(tower);
 	}
 	for (var i = 0; i < 10; i++) {
 		var enemy = new Enemy();
@@ -33,10 +33,10 @@
 		enemies.push(enemy);
 		self.addChild(enemy);
 	}
 	LK.on('tick', function () {
-		for (var i = 0; i < towers.length; i++) {
-			towers[i].shoot();
+		for (var i = 0; i < plains.length; i++) {
+			plains[i].shoot();
 		}
 		for (var i = 0; i < enemies.length; i++) {
 			enemies[i].move();
 		}