From the Super Mario Wiki
Beanstalk Jungle, or Sparkling Waters-, is the secret course of Sparkling Waters in New Super Luigi U. It is unlocked by reaching the secret exit of Haunted Cargo Hold, and its own completion will unlock Mount Fuzzy.
The level starts on a platform next to a rapidly growing beanstalk. Luigi must jump on the leaves, as the area autoscrolls. A ? Block containing a Yoshi is found nearby. A Lakitu throwing Piranha Pods is found, along with a Green Ring. The area then begins to scroll horizontally, and Luigi must jump across multiple beanstalks. Some Piranha Plants and a Big Piranha Plant are found on retracting leaves. At the end of the area, a group of Waddlewings and a red Warp Pipe that takes the player to an area with the Goal Pole are found.
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