From the Super Mario Wiki
Cooligan Shrooms, or Frosted Glacier-2, is the second course of Frosted Glacier in New Super Luigi U. It is unlocked by completing Broozers and Barrels, and its own completion will unlock Icicle Tower.
The level starts in a snowy area with a tilting mushroom with a ? Block above it. Cooligans are found sliding off of more tilting mushrooms, with a ? Block containing either a Super Mushroom or an Ice Flower depending on the player's current form above the third tilting platform. An icy platform is found, and many Cooligans are encountered on a slope. More tilting Mushrooms are found, along with a Cooligan-spawning Warp Pipe and another ? Block. Another Warp Pipe spawning Cooligans is found, along with four Brick Blocks. Tilting platforms are found above Munchers and Cooligans. The player then reaches some tilting mushrooms above a pit and the Goal Pole.
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