Street Fighter Alpha 3 Cheat Codes for Gameboy

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.

Unlock All Fighters
On the title screen, press LEFT, RIGHT, DOWN, RIGHT, L, L, A, L, L, B, R, A, UP.