Unlock Hidden EX Option Mode:
Press Triangle, Triangle, Right, Circle, L1 at the Main menu.

Unlock Akuma:
At the 'Character' selection screen highlight any character in the top row and press Up.

Unlock Alpha Chun Li:
At the 'Character' selection screen highlight Chun Li and hold 'Select' for 5 seconds and then press X.

Unlock Hyper Chun Li:
At the 'Character' selection screen highlight Chun Li, hold 'Select' for 5 seconds and press R1.

Unlock Apocalypse:
At the 'Character' selection screen highlight Akuma, hold 'Select' for 5 seconds and press R1.

Unlock Gouki:
At the character selection screen highlight Magneto, Juggernaut, Dhalsim or Vega and press Up.

Reset Game:
Hold R1 + L1 + Select + Start.