Mutator

A Mutator is a built-in component to the game which adds features or change the game characteristics in the Unreal series. All of the multiplayer-based Unreal games have Mutators, and some can be gametype-specific, such as "No Orbs" in UT3's Warfare gametype. Many Mods can be toggled on/off with the Use of Mutators.

Although, compared to conventional mods, changes made to the game are small, mutators can have a large impact on gameplay. For instance Instagib is sometimes considered a whole new gametype.

Unreal Tournament

In order to use the mutators, go to the settings in any non-campiagn game and select "Mutators."

Mutator	Description
Arena	Replaces every weapon and ammo pickup in the match with one of these, depending on which one is selected. See the page for more info.
Chainsaw Melee	The Impact Hammer is replaced by a Chainsaw.
FatBoy	Frag a lot, and your body grows. Be fragged a lot, and your body shrinks.
Instagib DM	Removes every pickup from the arena, and gives the players an Enhanced Shock Rifle, which causes players to explode into gibs instantly on being hit.
Instant Rockets	The Rocket Launcher won't fire 6 rockets, but one rocket at a time.
Jump Match	Enables players to jump extremely high.
Low Gravity	Reduces the gravity of the map.
No Health	Health Packs, Health Vials and Big Kegs O' Health are removed from the map. (Only available in UT: GOTY Edition through the use of the Chaos UT mod)
No Redeemer	Redeemers are removed from the map.
No Powerups	Invisibility, Shield Belt, Damage Amplifier, Jump Boots and the Big Keg O'Health are removed from the map.
Relics	(Bonus Pack 1) Add relics to the match. See the page for more info.
Stealth	Makes everyone invisible during a match.
Sword Arena	All weapons on the map are converted to a Chaos UT Bastard Sword, ammo is removed. (Only available in UT: GOTY Edition through the use of the Chaos UT mod)
Sword Melee	Everyone's melee weapon is a Chaos UT Bastard Sword. (Only available in UT: GOTY Edition through the use of the Chaos UT mod)
Team Beacon	(Bonus Pack 2) Your teammates have an arrow above their heads, so you can identify them.
Volatile Ammo	(Bonus Pack 2) Ammo explodes when hit by a weapon.
Volatile Weapon	(Bonus Pack 2) Weapons are discharged when a player dies.

Unreal Championship and Unreal Tournament 2003/2004

Of the options available while selecting a map, there is a section called "Mutators." Picking up and moving Mutators will toggle them as on or off. If you select a gamemode that does not support a certain Mutator (such as Low Gravity on Assault), the mutator will be deselected.

Mutator	UC	2003	2004	Description
Air Control	-	X	X	Changes how players move in the air.
Arena	X	X	X	Replaces weapons and ammo in map.
BigHead	X	X	X	Same effect as FatBoy, but with the user's body instead of just his/her head.
Big Wheels	-	-	X	ONS/AS only. Kill a lot, and your vehicle's wheels grow in size. Be killed a lot, and they'll shrink.
Bonus Combos	-	*	X	Adds the Pint-sized (LLLL) and Camouflage (RRRR) Adrenaline Combos.
Bonus Vehicles	-	-	**	Replaces certain vehicles with the Cicada, SPMA and Paladin.
Competition Mode	X	-	-	Disables Species specific attributes and levels the field to everyone. It's the inverse to Species Statistics.
Floaty Cadavers	X	X	-	Cadavers don't fall to the floor, but float.
Game Speed	-	-	X	Modifies the game's speed.
InstaGib	X	X	X	See Unreal Tournament section above.
Lightning Guns	-	-	X	Replaces all Sniper Rifles with Lightning Guns.
Lightweight Vehicles	-	-	X	ONS/AS only. When being hit, vehicles will fly higher and farther like balloons.
Link Gun Medic	X	-	-	The Link Gun heals teammates.
LowGrav	X	X	X	See Unreal Tournament section above.
No Adrenaline	X	X	X	Adrenaline pickups are removed from the map.
No Superweapons	-	X	X	Redeemers and Ion Painters are removed from the map. In 2004, the Target Painter is removed as well.
Onslaught Weapons	-	-	X	Adds ONS weapons (Mine Layer, Grenade Launcher, AVRiL and Target Painter) to the other gametypes.
QuadJump	-	X	X	Players can jump up to 4 times instead of 2.
Regeneration	X	X	X	All players regenerate health.
Slow Enemy	X	-	-	Reduces the enemy's speed.
Slow Motion Corpses	X	X	X	Dramatic slow-mo death animations.
Sniper Rifles	-	-	X	Same as Lightning Guns, but inverted: LG are replaced by SR.
Species Statistics	-	-	X	Each race has unique combat statistics.
Stunt Vehicles	-	-	X	ONS/AS only. Vehicles can jump. Hold down the crouch key to charge up and then release to jump. They can also control wheeled vehicles in mid-air.
Super Berserk	-	-	X	Weapons are insanely fast and powerful.
Team Regeneration	X	-	-	All members of your team regenerate health. That's still no excuse to shoot them.
UDamage Reward	-	-	X	Any remaining UDamage powerup is thrown from players when they are fragged.
UT Classic	-	-	X	Classic UT style weapons and movement options.
UT2003 Style	-	-	X	UT2003 style fast weapon switching and boost dodging.
UTV2004S	-	-	X	Required to support UTV2004 SeeAll mode.
Vampire	X	X	X	Damaging your opponents will regenerate your health.
Vehicle Arena	-	-	X	ONS/AS only. Replaces all vehicles in a map with a particular one.
Vehicle Pickups	-	-	**	Vehicles can pick up items and give them to the driver.
Zoom InstaGib	-	X	X	Same as Instagib, but the secondary fire is a zoom function.

(*) Available in UT2003 through Epic Bonus Pack. (**) Available in UT2004 through ECE Bonus Pack or Mega Pack.

Unreal Championship 2

Mutator	Description
Adrenaline Jumps	Players can make extra jumps by spending adrenaline.
Announce Powerups	Players receive notification when a powerup respawns.
Camp Fire	To prevent camping, all players carry a ticking time bomb. Kill your enemies to buy extra time. When the timer hits zero, your bomb explodes, killing you and anyone nearby.
Character Weapons Only	Only your starting pistols and melee weapons are allowed.
Classic UC	No adrenaline, locking, melee, or third person camera. Pure old school.
Double Adrenaline	Players gain adrenaline twice as fast.
Friendly Fire Damage	Attacks that hit friendly players do half damage instead of none.
Timer Displayed
Instagib	One shot, one kill. Melee weapons and high-power sniper rifles only.
Looting	Players drop their ammo and powerups when they die.
LowGrav	Gravity is reduced, but only for players.
LowGravAll	Gravity is reduced for players and world objects.
Melee Only	Only melee weapons are allowed.
No Adrenaline	Level the playing field by disabling all adrenaline abilities.
No Health Pickups	Health pickups are removed.
No Lock	Players cannot lock onto enemies.
No Melee	Melee weapons are not allowed.
Quad Jump	Airborne players can jump three times instead of once.
Radioactive	Players glow with radioactivity based on their score.
Random Pickup Respawn	Pickup and powerup respawn delays are randomized.
Retribution	Revenge is sweet! Take revenge on your killer to earn bonus points.
Rounds (Best of 3)	A match is played as a series of three rounds. Each round is played with normal game rules. The team who wins the most rounds wins the match.
Rounds (Best of 5)	A match is played as a series of five rounds. Each round is played with normal game rules. The team who wins the most rounds wins the match.
Speed Match	All players have Adrenaline-enhanced Speed, all the time.
Third Person Only	Force third person camera.
Vampire	All players have the Vampire ability active all the time. There are no health pickups; get your health by attacking your enemies.
Volatile	Ammo and health pickups explode when shot.
Wall Crawl	All players have the Wall Crawl ability active, all the time.
Weapon Master	All players start with the same weapon, randomly chosen. Once someone gets 5 kills, they are the Weapon Master. They receive a score bonus, and then a new weapon is selected. Only third-person perspective is allowed.

Unreal Tournament III

Go to the settings while selecting a map and clicking on "Mutators" will bring up the Mutators. Gamemodes conserve their own selection of Mutators, unlike other games, and all Mods will be visible at the botom of the list.

Mutator	Description
Big Head	See UC/UT2003/UT2004 section above.
Friendly Fire	Shooting teammates damages them. (50% damage) Only available in teamgames.
Handicap	Provides armor and weapon bonuses to losing players.
Instagib	See Unreal Tournament section above.
Kills Slow Time	Time slows down for a moment every time you kill an enemy. (Instant Action only)
LowGrav	See Unreal Tournament section above.
No Hoverboard	The players won't have the Hoverboard during a match. Only available in VCTF, Warfare and Greed.
No Orb	Removes the Orb from the map. Only available on Warfare.
No Super Pickups	Shield Belt, Berserk, UDamage, Invisibility, Invulnerability, Megahealth and Redeemers are removed from the map.
No Translocator	The players won't have the Translocator during a match. Only available in CTF and Greed.
SloMo	Slows the game's speed.
Speed Freak	Speeds the game's speed up.
Super Berserk	Players fire at Berserk speed for the entire match.
Survival	Spectating players spawn into the match after current players are killed (for the Duel gametype only).
Titan	Allow players to become Titans.
Weapon Replacement	Default weapon pickups in a level can be substituted with different weapons.
Weapons Respawn	Weapons respawn instead of always being available. (Inverse of Weapon Stay)

Trivia

• In UC2, it's possible to unlock mutators by running through the Ascension Rites, the Challenges or the Individual ladders. They are usually found at the match that unlocks them.