===================================================================
--- original.js
+++ change.js
@@ -17,14 +17,8 @@
 		fill: settings.fill || defaultFill,
 		font: settings.font || defaultFont,
 		size: settings.size || defaultSize
 	};
-	;
-	self.x = settings.x;
-	self.y = settings.y;
-	self.setText = setText;
-	self.setFill = setFill;
-	;
 	for (var i = 0; i < offsets.length; i++) {
 		var localSettings = i === offsets.length - 1 ? textSettings : borderSettings;
 		var text = self.addChild(new Text2(string, localSettings));
 		text.x += offsets[i][0] * weight;
@@ -34,22 +28,26 @@
 		}
 		textList.push(text);
 	}
 	;
+	self.x = settings.x;
+	self.y = settings.y;
+	self.setText = setText;
+	self.setFill = setFill;
+	;
 	function setText(string) {
 		for (var i = 0; i < textList.length; i++) {
 			textList[i].setText(string);
 		}
 	}
-	;
 	function setFill(newFill) {
 		textList[textList.length - 1].fill = newFill;
 	}
-	;
 });
 var Interface = Container.expand(function () {
 	var self = Container.call(this);
 	var score = 0;
+	var shown = true;
 	var scoreTxt = self.addChild(new BorderedText(score.toString(), {
 		size: 150,
 		anchor: {
 			x: .5
@@ -83,10 +81,13 @@
 		LK.effects.flashScreen(0xff0000, 1000);
 		LK.showGameOver();
 	}
 	function hideInstructions() {
-		moveInstructions.destroy();
-		jumpInstructions.destroy();
+		if (shown) {
+			shown = false;
+			moveInstructions.destroy();
+			jumpInstructions.destroy();
+		}
 	}
 });
 var ShiftableContainer = Container.expand(function () {
 	var self = Container.call(this);
@@ -102,9 +103,9 @@
 	return self;
 });
 var Background = ShiftableContainer.expand(function () {
 	var self = ShiftableContainer.call(this);
-	var baseShiftContainer = self.shiftContainer;
+	var baseShift = self.shiftContainer;
 	var backgroundBotGraphics = self.createAsset('background', 'Background Top image', 0, 0);
 	var backgroundTopGraphics = self.createAsset('background', 'Background Top image', 0, 0);
 	backgroundBotGraphics.width = STAGE_WIDTH;
 	backgroundBotGraphics.height = STAGE_HEIGHT;
@@ -159,8 +160,9 @@
 	}
 });
 var Box = ShiftableContainer.expand(function (x, y, args) {
 	var self = ShiftableContainer.call(this);
+	var baseShift = self.shiftContainer;
 	var {index, column} = args;
 	var speed = BOX_SPEED;
 	;
 	self.x = x;
@@ -191,8 +193,9 @@
 		hitboxGraphics.alpha = 0;
 		self.graphic = boxGraphics;
 		self.hitbox = hitboxGraphics;
 		self.shadow = shadowGraphics;
+		self.shiftContainer = shiftContainer;
 	}
 	function update(args) {
 		var destroyNextTick = false;
 		var upperBox = column.boxes[self.index + 1];
@@ -205,9 +208,9 @@
 		if (self.falling) {
 			var {player} = args;
 			speed += self.gravity;
 			self.y += speed;
-			var targetHeight = STAGE_HEIGHT - (self.index + 0.5) * BOX_HEIGHT - FLOOR_OFFSET - self.shift;
+			var targetHeight = BOX_LINE - self.index * BOX_HEIGHT;
 			if (self.y >= targetHeight) {
 				speed = 0;
 				self.x = 0;
 				self.y = targetHeight;
@@ -221,11 +224,8 @@
 		}
 		if (self.active) {
 			self.activation(args);
 		}
-		if (self.y > STAGE_HEIGHT + BOX_HEIGHT / 2) {
-			self.alive = false;
-		}
 		if (!self.alive) {
 			column.remove(self);
 			return true;
 		}
@@ -241,8 +241,16 @@
 		}
 		return false;
 	}
 	function touch(target) {}
+	function shiftContainer(amount) {
+		baseShiftContainer(amount);
+		;
+		if (self.y > BOX_LINE) {
+			column.remove(self);
+			return true;
+		}
+	}
 	;
 	return self;
 });
 var InvisBox = Box.expand(function (x, y, args) {
@@ -380,12 +388,19 @@
 			}
 		}
 	}
 });
-var Column = Container.expand(function (x, y, index) {
+var Column = Container.expand(function (x, y, args) {
 	var self = Container.call(this);
-	var boxes = [self.add(new InvisBox(0, STAGE_HEIGHT - FLOOR_OFFSET))];
+	var {index, boxList} = args;
+	var boxes = [];
 	var countdown = SPAWN_INITIAL + getCountdown();
+	var defaultBox = self.addChild(new InvisBox(0, BOX_LINE, {
+		column: self,
+		index: 0
+	}));
+	boxList.push(defaultBox);
+	boxes.push(defaultBox);
 	;
 	self.x = x;
 	self.y = y;
 	self.boxes = boxes;
@@ -423,9 +438,9 @@
 	function update(args) {
 		if (--countdown <= 0) {
 			countdown = getCountdown();
 			if (self.count < COLUMN_VOLUME) {
-				var {boxList, game} = args;
+				var {boxList} = args;
 				var typeValue = Math.random();
 				var typeInstance = BasicBox;
 				if ((typeValue -= SPAWN_GOLD_CHANCE) < 0) {
 					typeInstance = GoldBox;
@@ -435,9 +450,9 @@
 					typeInstance = PointsBox;
 				} else if ((typeValue -= SPAWN_STONE_CHANCE) < 0) {
 					typeInstance = StoneBox;
 				}
-				var box = game.addChild(new typeInstance(self.x, SPAWN_OFFSET, {
+				var box = self.addChild(new typeInstance(0, SPAWN_OFFSET, {
 					column: self,
 					index: boxes.length
 				}));
 				boxList.push(box);
@@ -447,9 +462,9 @@
 	}
 });
 var Player = ShiftableContainer.expand(function (x, y) {
 	var self = ShiftableContainer.call(this);
-	var baseShiftContainer = self.shiftContainer;
+	var baseShift = self.shiftContainer;
 	var isJumping = false;
 	var verticalSpeed = 0;
 	var floorHeight = y;
 	var targetColumn = Math.floor(x / BOX_WIDTH);
@@ -475,9 +490,9 @@
 	function getColIndex() {
 		return Math.floor(self.x / BOX_WIDTH);
 	}
 	function getRowIndex() {
-		return Math.floor((STAGE_HEIGHT - self.y - FLOOR_OFFSET) / BOX_HEIGHT);
+		return Math.floor((BOX_LINE - self.y) / BOX_HEIGHT + 0.5);
 	}
 	function move(direction) {
 		var colIndex = getColIndex();
 		if (targetColumn === colIndex) {
@@ -494,9 +509,9 @@
 		var {interface, columnList} = args;
 		var colIndex = getColIndex();
 		var rowIndex = getRowIndex();
 		var targetX = (targetColumn + 0.5) * BOX_WIDTH;
-		var targetY = floorHeight - columnList[colIndex].count * BOX_HEIGHT;
+		var targetY = BOX_LINE - columnList[colIndex].count * BOX_HEIGHT;
 		if (self.invulnerability > 0) {
 			self.invulnerability--;
 			if (self.invulnerability === 60 || self.invulnerability === 30) {
 				LK.effects.flashObject(playerGraphics, 0x000000, 1000);
@@ -517,8 +532,11 @@
 			if (self.y >= targetY) {
 				self.y = targetY;
 				self.airborne = false;
 				verticalSpeed = 0;
+				if (self.y === BOX_LINE) {
+					interface.isGameOver = true;
+				}
 			}
 		} else {
 			if (self.y < targetY) {
 				self.airborne = true;
@@ -566,8 +584,11 @@
 var CONTROL_TAP_TICKS = STAGE_TICKS / 3;
 var NUM_COLUMNS = 9;
 var BOX_WIDTH = STAGE_WIDTH / NUM_COLUMNS;
 var BOX_HEIGHT = 0.75 * BOX_WIDTH;
+var BOX_LINE = STAGE_HEIGHT;
+var BOX_SPEED = 5;
+var BOX_GRAVITY = 0.2;
 var PLAYER_SIZE = 0.8 * BOX_WIDTH;
 var PLAYER_GRAVITY = 0.5;
 var PLAYER_JUMP_SPEED = 20;
 var PLAYER_MOVE_SPEED = 25;
@@ -587,13 +608,10 @@
 var SHIFT_THRESHOLD = 6;
 var SHIFT_COUNT = 3;
 var SHIFT_DURATION = STAGE_TICKS / 3;
 var SHIFT_AMOUNT = SHIFT_COUNT * BOX_HEIGHT / SHIFT_DURATION;
-var BOX_SPEED = 5;
-var BOX_GRAVITY = 0.2;
 var TNT_COUNTDOWN = 2 * STAGE_TICKS;
-var FLOOR_OFFSET = 100;
-var COLUMN_VOLUME = Math.floor((STAGE_HEIGHT - FLOOR_OFFSET) / BOX_HEIGHT) + 1;
+var COLUMN_VOLUME = Math.ceil(BOX_LINE / BOX_HEIGHT);
 ;
 var Game = Container.expand(function () {
 	var self = Container.call(this);
 	;
@@ -603,16 +621,19 @@
 	var boxList = [];
 	var effectList = [];
 	var columnList = [];
 	var shiftTicks = 0;
-	;
 	var background = self.addChild(new Background(self));
 	var floor = self.addChild(new Floor(STAGE_WIDTH / 2, STAGE_HEIGHT));
 	for (var i = 0; i < NUM_COLUMNS; i++) {
-		columnList.push(self.addChild(new Column((i + 0.5) * BOX_WIDTH, 0, i)));
+		columnList.push(self.addChild(new Column((i + 0.5) * BOX_WIDTH, 0, {
+			index: i,
+			boxList
+		})));
 	}
-	var player = self.addChild(new Player(STAGE_WIDTH / 2, STAGE_HEIGHT - FLOOR_OFFSET - PLAYER_SIZE / 2));
+	var player = self.addChild(new Player(STAGE_WIDTH / 2, BOX_LINE - PLAYER_SIZE / 2));
 	var interface = LK.gui.topCenter.addChild(new Interface());
+	var shiftContainers = [[player, background, floor], boxList, effectList];
 	;
 	stage.on('down', function (obj) {
 		var event = obj.event;
 		lastTouchX = event.global.x;
@@ -634,11 +655,13 @@
 			var deltaX = lastTouchX - event.global.x;
 			var deltaY = lastTouchY - event.global.y;
 			if (Math.abs(deltaX) > CONTROL_SWIPE_DIST) {
 				var direction = deltaX > 0 ? -1 : 1;
+				interface.hideInstructions();
 				player.move(direction);
 				reset = true;
 			} else if (deltaY > CONTROL_SWIPE_DIST) {
+				interface.hideInstructions();
 				player.jump();
 				reset = true;
 			}
 			if (reset) {
@@ -651,14 +674,17 @@
 	LK.on('tick', function () {
 		if (interface.isGameOver) {
 			interface.gameOver();
 		} else if (interface.isPaused = shiftTicks > 0) {
-			var containers = [[background, floor, player], boxList, effectList];
 			shiftTicks--;
-			containers.forEach(function (subContainers) {
-				subContainers.forEach(function (container) {
-					container.shiftContainer(SHIFT_AMOUNT);
-				});
+			shiftContainers.forEach(function (containers) {
+				for (var i = containers.length - 1; i >= 0; i--) {
+					var container = containers[i];
+					if (container.shiftContainer(SHIFT_AMOUNT)) {
+						container.destroy();
+						containers.splice(i, 1);
+					}
+				}
 			});
 		} else {
 			var playerArgs = {
 				interface,