From the Super Mario Wiki
Seesaw Shrooms, or Meringue Clouds-2, is the second course of Meringue Clouds in New Super Mario Bros. U. It is unlocked via completion of Land of Flying Blocks and its own completion opens the path to Slide Lift Tower.
Like Mushroom Heights, this course is an athletic course with many Mushroom Platforms; these include stationary platforms, Stretch Shrooms, and Seesaw Shrooms. Yoshi makes an appearance in this course as well.
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