Bring up the console (press ~) and enter the following codes: god God Mode notarget No Target Mode noclip No Clipping give all All items, weapons, 999 ammo give jacketarmor Jacket Armor give blaster Blaster give shotgun Shotgun give sshotgun Super Shotgun give machinegun Machine gun give grenadelauncher Grenade Launcher give rocketlauncher Rocket Launcher give shells Shells give bullets Bullets give cells Cells give grenades Grenades give rockets Rockets give slugs Slugs give quad damage Quad Damage give invulnerability Invulnerability give silencer Silencer give rebreather Rebreather give health 100% health give weapons All weapons give ammo All ammo give armor Body armor Noticing a pattern? That's because you can type just about anything after 'give' and you'll get it....Try it with any other weapon or item and see! To skip levels: Press ~ to access the console, then type map xx where x is the level name. To get level name go to multiplay, host game, and select level name you wish to skip to (the bottom name is the name of the level). For instance, ~ map boss2 will take you to the final level.