Various cheats

     Enter the cheats in the console window (Activated by pressing ~):

Code                             Result 
god                              God Mode 
amphibious                       Breathe Underwater 
completelovol                    Finish All Levels 
allammo                          All Guns, Ammo 
ghost                            Walk Through Walls 
monstervsmonster                 Enemy Sees You as Monster 
fly                              Fly Mode 
walk                             Walk Mode 
behindview 1                     View Character from Behind 
behindview 0                     Normal View 
playersonly                      Freezes Time, Type Again to UnFreeze 
invisible 1                      Makes You Invisible 
invisible 0                      Makes You Visible Again 
killall [class]                  Kills All Actors of a Certain [class] 
killpawns                        Kills All Monsters 
say [message]                    Broadcast [message] to Other Players 
slomo #                          Sets Gamespeed to # (1.0 is normal) 
summon [class]                   Spawns Actor of the Specified [class] 
switchcooplevel [new level]      Server Switches to New Level w/
                                 CoOp Style Weapon Carrying 
switchlevel [new level]          Switch to a New Level