walls.add(game.add.tileSprite(newWorldStartX - WALL_THICKNESS, newWorldStartY - WALL_THICKNESS, newWorldEndX - newWorldStartX + WALL_THICKNESS * 2, WALL_THICKNESS, 'wall'));
walls.add(game.add.tileSprite(newWorldStartX - WALL_THICKNESS, newWorldEndY, newWorldEndX - newWorldStartX + WALL_THICKNESS * 2, WALL_THICKNESS, 'wall'));
walls.add(game.add.tileSprite(newWorldStartX - WALL_THICKNESS, newWorldStartY - WALL_THICKNESS, WALL_THICKNESS, newWorldEndY - newWorldStartY + WALL_THICKNESS * 2, 'wall'));
walls.add(game.add.tileSprite(newWorldStartX - WALL_THICKNESS, newWorldStartY - WALL_THICKNESS, newWorldEndX - newWorldStartX + WALL_THICKNESS * 2, WALL_THICKNESS, 'wall'));
walls.add(game.add.tileSprite(newWorldStartX - WALL_THICKNESS, newWorldEndY, newWorldEndX - newWorldStartX + WALL_THICKNESS * 2, WALL_THICKNESS, 'wall'));
walls.add(game.add.tileSprite(newWorldStartX - WALL_THICKNESS, newWorldStartY - WALL_THICKNESS, WALL_THICKNESS, newWorldEndY - newWorldStartY + WALL_THICKNESS * 2, 'wall'));