Snifberg the Unfeeling's Castle
From the Super Mario Wiki
The level begins with a segment containing Ice Snifits. It then escalates into a segment with ice blocks, turning onto one side at a time, similar to how Tox Boxes and Grumblumps move. The path leads to a door, which in turn leads to smaller moving ice blocks and the first checkpoint. More moving ice blocks lead to an area with more Ice Snifits as well as a Shy Guy-spawning warp pipe. This area leads to another door, which in turn leads to an area with more moving ice blocks, along with the second checkpoint. Even more moving ice blocks follow, along with giant ice blocks and the boss door.
Collecting all of the Wonder Wools knits Snifberg the Yoshi back together.
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