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The Mirror Hall, also known as the Mirror Mansion in Flipside and the Mansion Rorrim in Flopside, is a building in Super Paper Mario. It appears on the border of Flipside and Flopside, and serves to allow passage between the two towns. The hall can only be accessed after unlocking Fleep as his powers are required to reach it, and the heroes must travel through it in order to reach Flopside and locate the fifth Heart Pillar.
Within a hidden alley on the first floor of Flipside, the player must use Fleep on an interdimensional rift in order to reveal the 3D path that leads to the Mirror Hall. The hall contains four stained-glass windows depicting the sages of the Tribe of Ancients, as well as the eponymous mirror in the center and eight colored blocks, each corresponding to the doors atop Flipside and Flopside Towers. The player must then hit each of the blocks once in order for the mirror to shatter and allow them access to the building's other half, where they can exit the door and find themselves in Flopside.
Passing the Mirror Hall is the only free way of getting from Flipside to Flopside. However, the player can find Welderberg in two parts of Flipside who, if paid 300 Coins, will build a pair of arguably fast Warp Pipes between the interdimensional cities.
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