===================================================================
--- original.js
+++ change.js
@@ -1,53 +1,29 @@
-var STAGE_WIDTH = 2048;
-var STAGE_HEIGHT = 2732;
-var NUM_COLUMNS = 16;
-var COLUMN_WIDTH = STAGE_WIDTH / NUM_COLUMNS;
-var PLAYER_SIZE = 0.8 * COLUMN_WIDTH;
-var SPAWN_CONST = 30;
-var SPAWN_VARIANCE = 250;
-var SPAWN_TNT_CHANCE = 0.1;
-var BOX_SPEED = 5;
-var BOX_GRAVITY = 0.1;
-var FLOOR_OFFSET = 100;
-var Box = Container.expand(function (parent, x, y) {
+var Box = Container.expand(function (parent, x, y, targetHeight) {
 	var self = Container.call(this);
 	parent.addChild(self);
 	self.x = x;
 	self.y = y;
 	;
+	var typeValue = Math.random();
+	var type = typeValue <= SPAWN_TNT_CHANCE ? 'tnt' : 'basic';
 	var speed = BOX_SPEED;
-	var boxGraphics = self.createAsset('box', 'Falling box', .5, .5);
-	var hitboxGraphics = self.createAsset('hitbox', 'Box hitbox', .5, .5);
-	hitboxGraphics.alpha = 0.1;
+	var boxGraphics = self.createAsset(type + 'Box', 'Box graphics', .5, .5);
+	var hitboxGraphics = self.createAsset('hitbox', 'Hitbox graphics', .5, .5);
+	hitboxGraphics.alpha = 0.5;
 	;
 	self.hitbox = hitboxGraphics;
 	self.update = update;
 	;
 	function update() {
 		speed += BOX_GRAVITY;
 		self.y += speed;
+		if (self.y > targetHeight) {
+			self.y = targetHeight;
+			speed = 0;
+		}
 	}
 });
-var TntBox = Container.expand(function (parent, x, y) {
-	var self = Container.call(this);
-	parent.addChild(self);
-	self.x = x;
-	self.y = y;
-	;
-	var speed = BOX_SPEED;
-	var tntGraphics = self.createAsset('tnt', 'TNT box', .5, .5);
-	var hitboxGraphics = self.createAsset('hitbox', 'TNT hitbox', .5, .5);
-	hitboxGraphics.alpha = 0.1;
-	;
-	self.hitbox = hitboxGraphics;
-	self.update = update;
-	;
-	function update() {
-		speed += BOX_GRAVITY;
-		self.y += speed;
-	}
-});
 var Floor = Container.expand(function (parent, x, y) {
 	var self = Container.call(this);
 	parent.addChild(self);
 	self.x = x;
@@ -98,28 +74,32 @@
 	self.x = x;
 	self.y = y;
 	;
 	var countdown = SPAWN_CONST + Math.floor(Math.random() * SPAWN_VARIANCE);
+	var count = 0;
 	;
 	self.update = update;
 	;
 	function update(boxes) {
-		var newBox;
-		countdown--;
-		if (countdown <= 0) {
-			if (Math.random() < SPAWN_TNT_CHANCE) {
-				newBox = new TntBox();
-			} else {
-				newBox = new Box();
-			}
-			newBox.x = self.x;
-			newBox.y = 0;
-			boxes.push(newBox);
-			self.parent.addChild(newBox);
-			self.countdown = Math.floor(Math.random() * 100) + 50;
+		if (--countdown <= 0) {
+			count++;
+			boxes.push(new Box(self, x, y + SPAWN_OFFSET, STAGE_HEIGHT - count * COLUMN_WIDTH));
+			countdown = SPAWN_CONST + Math.floor(Math.random() * SPAWN_VARIANCE);
 		}
 	}
 });
+var STAGE_WIDTH = 2048;
+var STAGE_HEIGHT = 2732;
+var NUM_COLUMNS = 15;
+var COLUMN_WIDTH = STAGE_WIDTH / NUM_COLUMNS;
+var PLAYER_SIZE = 0.8 * COLUMN_WIDTH;
+var SPAWN_OFFSET = -100;
+var SPAWN_CONST = 30;
+var SPAWN_VARIANCE = 10 * 60 - SPAWN_CONST;
+var SPAWN_TNT_CHANCE = 0.02;
+var BOX_SPEED = 5;
+var BOX_GRAVITY = 0.1;
+var FLOOR_OFFSET = 100;
 var Game = Container.expand(function () {
 	var self = Container.call(this);
 	;
 	var lastTouchX = null;
@@ -138,18 +118,18 @@
 	LK.gui.topCenter.addChild(scoreTxt);
 	var isGameOver = false;
 	var tickOffset = 0;
 	;
-	LK.on('down', function (obj) {
+	stage.on('down', function (obj) {
 		var event = obj.event;
 		lastTouchX = event.global.x;
 		var currentTime = Date.now();
 		if (self.lastTapTime && currentTime - self.lastTapTime < 200) {
 			player.jump();
 		}
 		self.lastTapTime = currentTime;
 	});
-	LK.on('move', function (obj) {
+	stage.on('move', function (obj) {
 		if (lastTouchX !== null) {
 			var event = obj.event;
 			var currentTouchX = event.global.x;
 			var deltaX = currentTouchX - lastTouchX;
@@ -166,9 +146,9 @@
 				lastTouchX = currentTouchX;
 			}
 		}
 	});
-	LK.on('up', function (obj) {
+	stage.on('up', function (obj) {
 		lastTouchX = null;
 	});
 	LK.on('tick', function () {
 		if (isGameOver) {
@@ -185,9 +165,9 @@
 			if (box.y > STAGE_HEIGHT) {
 				box.destroy();
 				boxes.splice(i, 1);
 			} else if (player.intersects(box.hitbox)) {
-				isGameOver = true;
+				isGameOver = false;
 			}
 		}
 	});
 });