Easy difficulty bonus Beat and save the game on the easy difficulty setting to unlock a "One Hit Kill" and "Weapons Stay" options for multi-player mode. Invincibility Pause the game and press L2(2), R1, R2, R1, L2. Game Shark Codes Player 1 Codes Infinite Health 800CBDA0 0064 Have All Weapons 800C7F38 0FFF Infinite Armor 800C7F1E 0064 Infinite Shotgun & Super Shotgun Ammo 800C7F3C 0064 Infinite Machine Gun & Chaingun Ammo 800C7F3E 0064 Infinite Grenades & Grenade Launcher Ammo 800C7F40 0064 Infinite Rocket Launcher Ammo 800C7F42 0064 Infinite Hyper Blaster & BFG Ammo 800C7F44 0064 Infinite Rail Gun Ammo 800C7F46 0064 Super Jump (Press Square) D00C7DD0 8000 800CBD86 FEC7