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Enter the following codes at the title screen to get the corresponding effect...
64/74 Shiki mode
Enter Up(2), Down(2), Right, Left, Right, Triangle
Atlancer mode
Enter Left, Right(2), Down, Left(2), Right, Triangle
Queen fairy mode
Enter Left, Right, Left, Down(2), Right(2), Triangle
Star Geppy X
Enter Down, Left(2), Down(2), Right(2), Triangle
View FMV sequences
Enter Down(2), Left, Down(2), Left, Down, Triangle
Wild John mode
Enter Up, Down, Right, Up, Down, Right, Up, Triangle