Land of Flying Blocks
From the Super Mario Wiki
Land of Flying Blocks, or Meringue Clouds-1, is the first course of Meringue Clouds in New Super Mario Bros. U. It is unlocked via completion of Flight of the Para-Beetles or Roy's Conveyor Castle and its own completion unlocks a red Toad House, Seesaw Shrooms, and Switchback Hill.
The course's main gimmicks are blocks that appear when the player reaches a certain spot, and a ridable cloud that the player must use to navigate across the course.
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