Underground Maze of Pipes
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It first appears in the episode "Misadventure of Mighty Plumber", when Bowser and Mighty Plumber are trying to get to the Pipe Land Treasury. To do so, Mighty Plumber cracks open a pipe that spews water all over Bowser. A good portion of the episode takes place in the Maze, as Mario and Luigi try to stop Bowser and Mighty Plumber as they chase them through it.
A similar location appears in "Misadventures in Babysitting", when Kooky, Bully and Cheatsy Koopa toss a brat named Junior down a Warp Pipe to get rid of him. Junior is lost in a portion of the Pipe Maze, and is eventually rescued by Mario and Luigi, just as Kooky floods the entire area with lava.