The following is a meta-article, which explains a concept which usually falls out of one of the wiki's categorizations, yet it's still important to explain something.
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The following page lists all of the cheat codes for the different Unreal games. These cheat codes are also called Development codes, as they're used to debug and test maps and mutators.
Winners don't use cheats! Especially online!
This is NOT a page for multiplayer cheats. We STRONGLY discourage their use. Anyone who edits this page or any other page of the wiki with download links or mentions to online cheats WILL BE BANNED. No exceptions.
Press the tilde key (~) or the Tab key on your keyboard to open the cheat console. In older versions of the game, you need to enter the code IAmTheOne in order to enable cheats. Enter these codes for the desired effect:
god Prevents you from taking any damage.
loaded Gives all weapons fully loaded except for the Redeemer.
allammo Gives 999 ammo units for every currently carried weapon.
fly Lets you fly around the map.
ghost Lets you fly and walk through walls.
walk Takes you out of ghost or fly modes.
addbots <number> Adds the specified number of bots (AI players).
killpawns Removes everyone but you from the game.
killall <item> Removes all items of the indicated type.
slomo <1.0 .. 10.0> Slows o speeds up the game (default 1.0).
setspeed <1.0 .. 10.0> Changes the movement speed (default 1.0).
setjumpz <100.0 .. 1000.0> Changes the height to which you will jump (default 350).
fov <1.0 .. 170.0> Changes your field of view (default 90).
playersonly Stops time for everyone but you.
behindview <0/1> Toggles between first (0) and third (1) person view.
open <map name> Opens the specified map.
summon <item name> Instantly spawns an item in front of the player (see below).