Game Shark Codes:

Master code "must be on"       ECBB8E64 1456E60A 
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
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