Spinning Spirit House
From the Super Mario Wiki
Spinning Spirit House, or Meringue Clouds-Ghost House, is the Ghost House level of Meringue Clouds in New Super Mario Bros. U. It is unlocked by defeating Kamek at Slide Lift Tower, and its own completion unlocks Bouncy Cloud Boomerangs, A Quick Dip in the Sky, and Snaking above Mist Valley. The house also contains a secret exit that reveals a shortcut to Ludwig's Clockwork Castle.
The ghost house is infested with Boos and obstacles. The house also has a large room that contains many doorways, fake walls, and stone walls that prevent the player from progressing. The stone blocks in the room disappear when the player makes their way through certain rooms in the house.
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