From the Super Mario Wiki
Wiggler Stampede, or Soda Jungle-7, is the seventh course of Soda Jungle in New Super Mario Bros. U, located outside the haunted sub-area of Soda Jungle. It is unlocked via completion of Painted Swampland or Deepsea Ruins, or via the secret exit in Bridge over Poisoned Waters and its own completion unlocks Iggy's Volcanic Castle.
This level begins in a forest area, above a pit of poison with a Big Wiggler in it. A tilting Mushroom Platform is found, with a ? Block above it. A Wiggler is found, along with a Big Wiggler in poison. A Wiggler is found on a slope, followed by another Big Wiggler in poison. Some tilting mushroom platforms are found above the poison, followed by a platform with the Checkpoint Flag on it. A Big Wiggler is found in poison next to a Brick Block wall. A P Switch must be pressed, allowing the player to cross the poison on the Big Wiggler. Koopa Paratroopas are found, along with another P Switch. Some more mushroom platforms are found, one of which has a Wiggler on it. A ? Block is also found. The player must cross the poison on the Big Wiggler, where more Koopa Paratroopas are encountered. Some platforms are found, along with a Roulette Block and a Wiggler. Another tilting mushroom platform and two stationary mushroom platforms are found. After crossing more poison, the Goal Pole is found.
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