Slippery Rope Ladders
From the Super Mario Wiki
Slippery Rope Ladders, or Layer-Cake Desert-, 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 Fire Piranha Plant 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 Fire Piranha Plant is next to a rope ladder above a 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 Fire Piranha Plants. 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.
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