From the Super Mario Wiki
Painted Pipeworks, or Soda Jungle-4, is the fourth course of Soda Jungle in New Super Luigi U. It is unlocked by completing Boo's Favorite Haunt, and its own completion will unlock Sumo Bro Bridge and Wiggler Floodlands.
The level starts in a jungle near three Piranha Plants, two of which are in moving Warp Pipes. A ? Block is also found. Some Warp Pipes are found moving in and out of poison, with a Red Ring found above. A Piranha Plant is found in one of the Warp Pipes. A stationary blue Warp Pipe is found, followed by a group of four rotating pipes. Some moving Warp Pipes are found above the poison, some of which contain Piranha Plants. Some stationary pipes are found, along with two swinging ones with Piranha Plants in them. The player then arrives in an area with Bowser in the background and the Goal Pole in sight.
The level's secret exit can be found by entering a red Warp Pipe found by climbing on top of a swing Warp Pipe found near the end of the level, which leads an area with the Goal Pole.
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