From the Super Mario Wiki
Stoneslide Tower, or Layer-Cake Desert-Tower, is the second tower in New Super Mario Bros. U. It features stone platforms that are movable by spinning on wooden screws. After completing this level for the first time, Magikoopa flies around Peach's Castle and a tornado starts to form around it. This level is unlocked by completing either Perilous Pokey Cave or Fire Snake Cavern, and completing this level unlocks a labyrinth of connected Stone-Eyes on the overworld map that serve as the location for both Goomba and Fire Bro enemy courses. Navigating the enemy courses unlocks Spike's Spouting Sands and Dry Desert Mushrooms.
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