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Playstation - Jikkyou American Baseball cheats

Unlock Giant head mode
Press Circle, X, Triangle, Square, Select, Up, L1, L2, R1, R2 buttons 
at the title screen to unlock big head mode.

Unlock Funny head mode
Press Circle, X, Triangle, Square, Select, Down, L1, L2, R1, R2 buttons
at the title screen to unlock Funny head mode.