Level skip
 
 While playing a game, hold L1 + R1 + R2 + Select and press X, Circle, 
 Square, Triangle, X, Circle, Square, Triangle.  
 
 
 Bonus characters and level
 
 Successfully complete campaign mode on the "I Can Win" difficulty 
 setting. A bonus level and two hidden characters will appear after 
 the credits. Successfully complete the bonus level to unlock it 
 and the new characters in multi-player mode.
 
 
 
 Pause in multi-player mode
 
 Since the game does not have a pause option in multi-player mode, 
 simply press Start, then highlight "Quit" and press X. Your game 
 will be paused, but it will not quit unless you select "Yes". To 
 resume the game, select "No".
 
 
 Game Shark Codez: 
 
 Master Code (Must Be On):
 ECBB8E64 1456E60A
 
 Max Machine Gun Ammo:
 4CFF0730 1456E404
 
 Max Shotgun Ammo:
 4CFF0734 1456E404
 
 Max Plasma Gun Ammo:
 4CFF0748 1456E404
 
 Max Chain Gun Ammo:
 4CFF075C 1456E404
 
 Max Grenade Launcher Ammo:
 4CFF0738 1456E404
 
 Max Rocket Launcher Ammo:
 4CFF073C 1456E404
 
 Max Frag Medals:
 4C002DEC 1456089C
 
 Max Impressive Medals:
 4C002D1C 1456089C
 
 Max Gauntlet Medals:
 4C002C4C 1456089C
 
 Max Excellent Medals:
 4C002C7C 1456089C
 
 Max Accuracy Medals:
 4C002CAC 1456089C
 
 Max Perfect Medals:
 4C002CDC 1456089C
 
 Max Flag Time:
 4C00ACCA 14561DA6
 
 999 Frags:
 4CFF0468 1456E404
 
 Never Been Killed:
 4CFF048C 1456E7A5
 
 Extra Armor:
 0CFF0438 1456E7A5
 4CFF0438 1456E7DD
 0CE15EBC 1456E7A5
 4CE15EBC 1456E7DD