From the Super Mario Wiki, the Mario encyclopedia
Skyward Stalk, or Sparkling Waters-, is the secret course of Sparkling Waters in New Super Mario Bros. U. It is unlocked via the secret exit in Haunted Shipwreck. Its completion skips Soda Jungle and unlocks Rock-Candy Mines and Fuzzy Clifftop. Its name may be a reference to The Legend of Zelda: Skyward Sword, another game produced by Nintendo.
The level begins near a Flying ? Block, as well as a giant beanstalk that grows out of the ground and sprouts Leaf Platforms, allowing access to the next section. The second section autoscrolls, and the beanstalk containers to grow and sprout giant Leaf Platforms and other plant life. Waddlewings are encountered, and a Red Ring is found above a Leaf Platform that extends and retracts. More Waddlewings are encountered, as well as Goombas on balloons. Waddlewings and Goombas continue to appear as the player climbs the beanstalk. When the top of the area is reached, the player is taken to an area with the Goal Pole.
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