Start the game with the "+set console 1" command line parameter. Press ~ to display the console window, then type "cheats on" to enable cheat mode. Then, enter one of the following codes in the console window to activate the corresponding cheat function. Note: Cheats are only effective after starting a new game; they cannot be used with an existing saved game.
Result
Cheat Code
God mode god
Additional health health [100 or greater]
Increase power boost power
Increase attack boost attack
Increase speed boost speed
Increase acro boost acro
Increase vitality boost vitality
Increase all stats boost all
Weapon select weapon_give_[1-10]
Infinite ammunition g_unlimited_ammo 1
Kill all monsters in current level massacre
Invisibility notarget
Rampage mode rampage
No clipping mode noclip
Cycle three camera views cam_toggle
Camera focused on next monster cam_nextmon
Cycle all characters on level cam_nextmon
Cycle sidekicks on level cam_nextsidekick
Screenshot screenshot
Change game speed, 1.0 is default timescale [speed]
Level select map [level name]
Key command binding bind [key and command]
Select active server connect [server]
Toggle game engine messages developer [1 or 0]
Toggle clean map load with no caching flushmap [1 or 0]
Toggle rendering speed display r_speeds [1 or 0]
Toggle flat-shaded polygons r_drawflat [1 or 0]
Toggle lightmaps on surfaces r_fullbright [1 or 0]
Toggle line drawing (not available on Voodoo cards) gl_polylines [1 or 0]
Disable cheats cheats 0