- walls.add(game.add.tileSprite(WALL_BORDER, WALL_BORDER, game.world.width - (WALL_BORDER * 2), WALL_THICKNESS, 'wall'));
- walls.add(game.add.tileSprite(WALL_BORDER, game.world.height - WALL_THICKNESS - WALL_BORDERBOTTOM, game.world.width - (WALL_BORDER * 2), WALL_THICKNESS, 'wall'));
- walls.add(game.add.tileSprite(WALL_BORDER, WALL_BORDER, WALL_THICKNESS, game.world.height - WALL_BORDER - WALL_BORDERBOTTOM, 'wall'));
- walls.add(game.add.tileSprite(game.world.width - WALL_THICKNESS - WALL_BORDER, WALL_BORDER, WALL_THICKNESS, game.world.height - WALL_BORDER - WALL_BORDERBOTTOM, 'wall'));
- walls.children.forEach(function(wall) { wall.body.immovable = true; });