From the Super Mario Wiki
Screwtop Tower, or Rock-Candy Mines-Tower2, is the second Tower of Rock-Candy Mines in New Super Mario Bros. U. It is unlocked via completion of Walking Piranha Plants! or Thrilling Spine Coaster, and its own completion opens the path to red and blue ! Switches, Shifting-Floor Cave, and the second entrance to Roy's Conveyor Castle.
The main gimmicks of the course are Screwtop Platforms, which move when the bolt on top is spun by the player. Sumo Bros. make their only appearance in this course, and their lightning electrocutes the platforms below instead of causing a wave of fire. The orange platforms from World 2-2 of New Super Mario Bros. also make their return here.
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