From the Super Mario Wiki
Weighty Waddlewings, or Frosted Glacier-4, is the fourth course of Frosted Glacier in New Super Luigi U. It is unlocked by completing Fire and Ice, and its own completion will unlock Peek-a-Boo Ghost House.
The level starts in a snowy area with two ? Blocks and Brick Block, followed by a scale. Two Banzai Bill are fired from the right side of the screen, and a Waddlewing is found on a platform. Another scale is found, along with a few gliding Waddlewings and a Banzai Bill Cannon. A group of three Waddlewings are found, and one of them holds a Super Acorn. Another Banzai Bill is found above them. More scales and Waddlewing are found, along with a platform with a Banzai Bill below it. One more scale is found, followed by three Banzai Bill Cannons. The player then arrives at the Goal Pole.
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