Morton's Compactor Castle
From the Super Mario Wiki
Morton's Compactor Castle, or Layer-Cake Desert-Castle, is the Castle course of Layer-Cake Desert in New Super Mario Bros. U. It is unlocked via completion of Blooming Lakitus, and its own completion opens a fork to both Sparkling Waters and Frosted Glacier.
The main obstacles of the castle are stone blocks that constantly move back and forth, which can crush the player. They also move constantly on the lava in the same direction. At the end of the course is a boss battle with Morton Koopa Jr., who uses his magic hammer to knock Big Pokey segments at the player.
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