The Mushroom World is the homeworld of Mario and Luigi and one of the main areas in Mario and Sonic Worlds In Danger. In the series, Bowser and Dr. Eggman are trying to merge the Mushroom World and Mobius together in order to create the ultimate empire. Due to this, many dimensional portals have been opening up throughout both worlds, allowing Sonic and his friends to travel to the Mushroom World, and Mario and his friends to Mobius. The planets are merging as we speak.

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