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 arrow lifts. Next, there is a horizontal path with some pits and some small-sized platforms with a Green Ring. Above the arrow sign is a Hidden Block with a Mini Mushroom. There are three Brick Blocks that contain 1-Up Mushrooms. This is 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.
- Star Coin 1: The first Star Coin is floating above the Bill Blaster path.
- Star Coin 2: Near the start of the rainbow line in the second area, there is a secret pipe behind the blocks that leads to a bonus area, where the Star Coin can be obtained by using the arrow lift and the POW Block.
- Star Coin 3: In the second vertical area, the player must activate the Blue Ring to turn the three subsequently found Brick Blocks into coins, opening a passage to the third Star Coin.
- In a secret room reached by a pipe hidden on a wall to the left of the final path, there is a large 8-bit sprite of Luigi jumping.