From the Super Mario Wiki
The Ancient Waterworks is an old, decrepit structure that Wario explores during the events of Wario: Master of Disguise. It is located in the middle of a jungle and houses the third Wishstone piece, which is hidden behind a large waterfall. Its inhabitants consist primarily of monstrous plants such as Seed Weeds and Thorn Weeds. The water here is purple and many platforms fall from the ceiling, damaging Wario if he gets hit.
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