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 * In the beta version of Super Mario Bros. 3, Koopa Troopas and Hammer Bros. were once planed as the game's minigame hosts, but they got replaced by Toads for unknown reasons.
 * A Microgame called Wario Bros. appeared in WarioWare, Inc.: Minigame Mania as reference to the classic game Mario Bros.
 * An unused Switch Palace accessible from Valley of Bowser 3 in the beta version of Super Mario World could cause the game to glitch.