Quake 3 Arena Cheats (C) iD
  
   INSTALLATION:

   Start a server with cheats enabled using the devmap command in the 
   console. Ex. "devmap q3test1" Once in the game, go back in the console 
   and type any of the following: 

   give all - get all weapons + the grappling hook
   give health 
   give armor 
   give quad damage 
   give personal teleporter 
   god 
   allammo 

  Unlock All Cinematics
From a dos prompt in your Quake3 directory, type:
quake3.exe +seta g_spVideos "\tier1\1\tier2\2\tier3\3\tier4\4\tier5\5\tier6\6\tier7\7\tier8\8" 

Unlock All Levels at Skill 1
Bring down console and type: /iamacheater 

Unlock All Levels at Skill 100
Bring down console and type: /iamamonkey 

In order to use the following cheats in multiplayer mode, the server must have cheats enabled (ie: /devmap +map [name])

God Mode
Bring down console and type: /god 

All Weapons
Bring down console and type: /give all 

You can also use the following codes with the /give command: 

allammo
armor
battle suit
bfg10k
flight
gauntlet
grappling hook
grenade launcher
haste
health
invisibility
lightning gun
machinegun
medkit
personal teleporter
plasma gun
quad damage
railgun
regeneration
rocket launcher
shotgun