Wild John mode:
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Press Up, Down, Right, Up, Down, Right, Up, Triangle at the title screen.
Queen fairy mode:
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Press Left, Right, Left, Down(2), Right(2), Triangle at the title screen.
64/74 Shiki mode:
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Press Up(2), Down(2), Right, Left, Right, Triangle at the title screen.
Atlancer mode:
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Press Left, Right(2), Down, Left(2), Right, Triangle at the title screen.
Star Geppy X:
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Press Down, Left(2), Down(2), Right(2), Triangle at the title screen.
View FMV sequences:
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Press Down(2), Left, Down(2), Left, Down, Triangle at the title screen.