Street Fighter Alpha 3

Play as Evil Ryu and Guile:
Access world tour mode, then build your character to level 30 and 31.

Play as Shin Gouki:
Access world tour mode, then build your character to level 32 and defeat all Gouki's. Then on the character selection screen, highlight Gouki (Akuma), hold L2 and press any button.

Dramatic and Final Battle mode:
Beat arcade mode on difficulty level 8.

Fight Super Akuma in Final Battle mode:
Access Final Battle mode. Then select a character and hold L1 + L2 before the versus screen appears.

Bonus modes:
Beat Dramatic Battle mode with Ryu/Ken and Juni/Jill to unlock two bonus modes.

Classical mode:
Accumulate three hours of game play on the timer in the options menu. Then at the character selection screen, highlight a character and press Select to play the classic version of their character.

Saikyo (low guard meter) mode:
Accumulate four hours of game play on the timer in the options menu. Note: Saikyo Karin does not have the ability to do a 99% throw. Alternatively, beat arcade mode on difficulty level 7.

Maji (LO) mode:
Accumulate five hours of game play on the timer in the options menu. Alternatively, beat arcade mode on difficulty level 7.

All modes:
Accumulate ninety-six hours of game play on the timer in the options menu to unlock all modes.

Alternate introduction sequence:
Accumulate forty-eight hours of game play on the timer in the options menu. Then, instead of showing the arcade characters, the opening sequence will shows all the new characters (including Guile and Evil Ryu). Alternatively, unlock all character endings including the bonus characters.

Alternate Balrog:
Beat world tour mode without unlocking Evil Ryu or Guile. Then at the character selection screen in any mode, highlight Balrog, hold and press any button.