Open up cheat menu: (enter this code fast at the main menu screen)
Left Trigger 2x, Right Trigger 2x, X 2x, Y 2x, B 2x.
Extreme Mode:
Complete the game on the hard difficulty setting.
Extreme difficulty:
Beat the game on Hard.
Open up cheat menu: (enter this code fast at the main menu screen)
Left Trigger 2x, Right Trigger 2x, X 2x, Y 2x, B 2x.
Extreme Mode:
Complete the game on the hard difficulty setting.
Extreme difficulty:
Beat the game on Hard.