Snaking above Mist Valley
From the Super Mario Wiki
Snaking above Mist Valley, or Meringue Clouds-6, is the sixth level of Meringue Clouds in New Super Mario Bros. U. It is unlocked via completion of Spinning Spirit House, Bouncy Cloud Boomerangs, or A Quick Dip in the Sky, and its own completion unlocks Ludwig's Clockwork Castle.
Like Bouncy Cloud Boomerangs, the clouds are pinkish-peach instead of white. Almost all of this course requires the use of Snake Blocks. When the player touches the snake blocks, the level immediately begins to autoscroll, most likely due to the fact that the Snake Blocks are constantly moving. One Pipe Cannon takes the player to the Checkpoint Flag in the middle of the level.
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