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There exists an unused title screen within the game's files.
Contributed by Mr. Kite
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Using Action Replay codes, it is possible to play as the Red and Green Koopa Kids. Their character models and behaviors are mostly broken as they are missing several animations, all voice clips (as they use Mario and Luigi's) and party board HUB sprites. There is a value for the Blue Koopa Kid as well, however using the code will make the game crash.
Contributed by KidDivinegon