taken from http://www.cheatcc.com/pc/unrealtournament3cheatscodes.html
At the character selection screen, choose the "Unlock Character" option, then enter "phayder" as a code to unlock Alanna (Necris).
At the character selection screen, choose the "Unlock Character" option, then enter "jihan" as a code to unlock Ariel (Iron Clad).
Successfully complete the indicated task to unlock the corresponding character:
Lauren: Always select the second choice for all missions. Kill Lauren in Deathmatch in Chapter 2 of Campaign mode. Lauren will eventually become unlocked after a subsequent Deathmatch in that chapter.
Scythe: Always select the second choice for all missions. Kill Scythe in Deathmatch in Chapter 4 of Campaign mode. Scythe will eventually become unlocked after a subsequent Deathmatch in that chapter.
Matrix: Always select the second choice for all missions. Kill Matrix in Deathmatch in Chapter 3 of Campaign mode. Matrix will become unlocked after a side mission in Chapter 3 in that chapter.
Akasha: Kill Akasha in the final mission.
Loque: Unlocked after a Capture The Flag match in Chapter 5.
Damian: Unlocked in Chapter 4 of Campagin mode.
Kragoth: Unlocked in Chapter 4 of Campagin mode.
Malakai: Unlocked in Chapter 4 of Campagin mode.
In the "Heatray" level in Multiplayer Deathmatch mode, after the Dark Walker drops, destroy it to get a Damage Amplification.
While playing the game, press ~ or [Tab] to display the console window. Then, type one of the following codes and press [Enter] at the console window to activate the corresponding cheat function:
| Result | Cheat Code |
| God mode | god |
| All weapons | allweapons |
| Full ammunition for all weapons | allammo |
| All weapons and full ammunition | loaded |
| Kills all enemies | killbots |
| Unlock all characters | unlockallchars |
| Freeze AI movement | playersonly |
| Flight mode | fly |
| No clipping mode | ghost |
| Disable flight and no clipping mode | walk |
| Spawn indicated object | summon [name] |
| View frame rate | stat fps |
| Set game speed | slomo [number] |
Use one of the following values with the "summon [name]" code:
| Object | Code |
| Axon Cicada | utgamecontent.utvehicle_cicada_content |
| Axon Goliath | utgamecontent.utvehicle_goliath_content |
| Axon Hellbender | utgamecontent.utvehicle_hellbender_content |
| Axon Leviathan | utgamecontent.utvehicle_leviathan_content |
| Axon Manta | utgamecontent.utvehicle_manta_content |
| Axon Paladin | utgamecontent.utvehicle_paladin_content |
| Axon Raptor | utgamecontent.utvehicle_raptor_content |
| Axon Scorpion | utgamecontent.utvehicle_scorpion_content |
| Axon SPMA | utgamecontent.utvehicle_spma_content |
| Nacris Darkwalker | utgamecontent.utvehicle_darkwalker_content |
| Necris Fury | utgamecontent.utvehicle_fury_content |
| Necris Nemesis | utgamecontent.utvehicle_nemesis_content |
| Necris Nightshade | utgamecontent.utvehicle_nightshade_content |
| Necris Scavenger | utgamecontent.utvehicle_scavenger_content |
| Necris Viper | utgamecontent.utvehicle_viper_content |
| Slow Volume Cube | utgamecontent.utslowvolume_content |