Street Fighter Alpha 3 (Gameboy)
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Unlock All Fighters
On the title screen, press LEFT, RIGHT, DOWN, RIGHT, L, L, A, L, L, B, R, A, UP.
Unlock All Modes
On the title screen, press A, UP, A, L, R, RIGHT, L, RIGHT, A, DOWN, RIGHT. Now press L, RIGHT, A, R, UP,L, RIGHT, B, A, UP, RIGHT, DOWN, RIGHT.