The Walls Have Eyes

The Walls Have Eyes, or Layer-Cake Desert-4, is the fourth level in the second world of New Super Luigi U, Layer-Cake Desert. It can be accessed upon completion of Wind-Up Tower. Clearing the level's main exit gives access to Morton's Lava Block Castle. A secret exit leads to Slippery Rope Ladders.

Layout
Luigi starts the level in front of a Moai statue. Going to the right, there is a tunnel where infinite statues slide to the left. Exiting the tunnel, there will be three Moai statues forming a bridge, and a Waddlewing roams above it. Next, there are pendulous statues, and among them a Warp Pipe and a Super Piranha Plant. After this section, Luigi encounters shifting statues followed by two more Super Piranha Plants. Three more Moai statues help Luigi to get to the Goal Pole.

Star Coins

 * Star Coin 1: Follows a statue in the first tunnel. Luigi must push it down using a Ground Pound to have access to the Star Coin.
 * Star Coin 2: Luigi must Ground Pound the middle statue in the area where the single Waddlewing is found. After this, he must jump, revealing a secret block with a Beanstalk. Climbing it, Luigi finds a bonus room with the Star Coin, some coins and a swinging statue.
 * Star Coin 3: Just beneath a statue before the Super Piranha Plants, above a pit.

Secret Exit
Luigi must Ground Pound the piece of land between the Waddlewing section and a Mini Warp Pipe. He will break some Brick Blocks and reveal a hidden Cannon Pipe, that blasts him to the secret Goal Pole. It opens the level, Slippery Rope Ladders. However, Super Luigi is needed to do this.

Luigi Sighting
The player can find Super Luigi's crouching 8-bit sprite in the underground bonus room that is reached entering a mini-sized Warp Pipe. However, there are no Mini Mushrooms in the level, and one must be obtained from another level.

Enemies

 * Waddlewing
 * Super Piranha Plants

Trivia

 * The name of this level is a pun on The Hills Have Eyes, which is the name for various works, or from the Japanese proverb: "Walls have ears, and the shōji (Japanese windows made of paper) have eyes."