From the Super Mario Wiki
Rainbow Skywalk or Meringue Clouds-3 is the third level of Meringue Clouds in New Super Luigi U. Along with Wiggler Rodeo, it is unlocked when Frozen Fuzzies is beaten and unlocks Stonecrush Tower if completed.
As its name states, this level is mainly set on halls surrounded by rainbow walls, as well as colorful wooden blocks. The first part is a vertical way with Bill Blasters on each side, and the players must get to the top using two Switchbacks. Next, there is a horizontal path with some pits and some small-sized platforms with a Green Ring at one point, followed by the final area, where a Blue Ring, a couple of Waddlewings and a few Bill Blasters appear. At the end of this area, there is the Goal Pole.
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