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+---- Thread: SSX on Tour - Gamecube version contains playable Mario characters. (/thread-4355.html)
SSX on Tour - Gamecube version contains playable Mario characters. - GamerBen144 - 10-12-2018
The GameCube version contains a few playable Super Mario Bros. characters (Mario, Luigi, and Peach).
https://m.youtube.com/watch?v=6aSvtH7RiRQ
According to IGN, this was part of a deal Nintendo made with EA in using third-party characters for their games.
https://www.ign.com/articles/2005/08/27/mario-joins-ssx-on-tour