Slippery Rope Ladders, or Layer-Cake Desert-firepiranha, is the secret level of Layer-Cake Desert in New Super Luigi U. It can be accessed by completing The Walls Have Eyes using the secret exit. Clearing this level gives access to Giant Swing-Along.
Luigi starts the level in an icy area with two Piranha Plants and a Venus Fire Trap under some ice blocks. A rope ladder is seen next to a Big Piranha Plant on a moving Warp Pipe. Two Big Venus Fire Traps are encountered, one of which is below a ? Block. A Venus Fire Trap is next to a rope ladder above a Bottomless pit. A ? Block and two Koopa Troopas appear, followed by a rope ladder. A Red Ring is below the ladder, and moving green Warp Pipes on the wall contain Piranha Plants, while two moving red pipes contain Venus Fire Traps. More ladders must be climbed, and two Fire Bros are encountered at the top of the area. A Warp Pipe is found, and leads the player to an area with a starry sky and the Goal Pole.
- Star Coin 1: After passing the second big Venus Fire Trap, go on the right wall of the platform to the right of that plant and stay on it until you get the star coin. After that, wall jump to the ladder to avoid death.
- Star Coin 2: When going upwards, there are two ladders next to each other that are different lengths. Climb a little bit of the ladder on the right and jump to the shorter ladder on the right leading to the second Star Coin.
- Star Coin 3: Right after the second Coin, get the third star coin right before entering the pipe leading to the flagpole on the right while avoid the Fire Bros.
Hidden Luigi image
Near the third Star Coin, have the Fire Bros. melt the ice and see the picture of Super Luigi from Super Mario Bros. sliding.