Beat the game on Easy. This will give you "One Hit Kill" and "Weapons Stay"
options in multi-player.
Beat the game on Medium. This will give you "Game Speed" and "Blast Force" option
in multi-player, as well as the Bronze cheats.
Beat the game on Hard. This will give you "Infinite Ammo" and "All
Weapons" options in multi-player, as well as the Silver cheats.
Infinite Health P1 800cbda00064
Infinite Armor P1 800c7f1e0064
Infinite Shotgun & 800c7f3c0064
Super Shotgun Ammo P1
Infinite Machine Gun 800c7f3e0064
& Chaingun Ammo P1
Infinite Grenades & 800c7f400064
Grenade Launcher Ammo P1
Infinite Rocket 800c7f420064
Launcher Ammo P1
Infinite Hyper Blaster & 800c7f440064
BFG Ammo P1
Infinite RailGun Ammo P1 800c7f460064
Super Jump d00c7dd08000
(Press Square) P1 800cbd86fec7
Thanks to Revolution readers Sjoerd Heldens, alex gibson, Kyle Winfield, IGGY,
Paul Hand, Evan Peck, and Saiful Rizal!