Once you hit the last button you'll be taken back to your game with a full ammo load-out.

Unreal Tournament Big Head Mutator
At the Main Menu press:
LEFT, RIGHT, LEFT, RIGHT, LEFT, RIGHT, CIRCLE, CIRCLE, CIRCLE.

Now, enter the multiplayer option. Select how man players then at the level select screen you can highlight the MUTATORS option and hit X. Highlight the big head option and press RIGHT. now press the X button and enter the game.

Unreal Tournament God Mode
During the game you can press the START button and enter:
Square, Circle, Left, Right, Circle, Square.

Once you hit the last button you'll be taken back to the game, but this time you're invincible.

Unreal Tournament Stealth Mutator
At the Main Menu press:
SQUARE, SQUARE, CIRCLE, CIRCLE, SQUARE, SQUARE, CIRCLE, CIRCLE

Now, enter the multiplayer option. Select how man players then at the level select screen you can highlight the MUTATORS option and hit X. Highlight the STEALTH option and press RIGHT. now press the X button and enter the game.

Unreal Tournament All Characters
Pause the game and then press:
LEFT, LEFT, CIRCLE, CIRCLE, RIGHT, LEFT, CIRCLE

Unreal Tournament Four Players Without A MultiTap
All you need is a "USB" keyboard and mouse.This will also allow you to play four player via two keyboards and two controllers. Just set the controller configuration so the keyboards and mouse's are in the third and fourth player positions.

Unreal Tournament Fatboy
To unlock a new Mutator that makes you get fatter and fatter with every Frag, and skinnier and skinnier with every time you get Fragged, just perform the following code.At the Title screen enter:
O, O, O, UP, DOWN, DOWN, UP, O, O, O.
You can now go to Multiplayer Mode and there will be a new Mutator called Fatboy. Turn this Mutator on and enjoy the antics.

Unreal Tournament 4 Player iLink
Oh! So that's why Infogrames mentions the ability to hook up "3 and 4 consoles". But wait, the game only allows two players using two consoles hooked up through an iLink cable, what do I do?

Never fear, IGN is here with the answer.

• First you'll need , at least, a 4 point fire-wire hub (you can buy these at any computer part store).
  
• Secondly, you'll need three other friends their iLink cables and (of course) their playstations.
  
• Now, hook them all together using you iLink cable and your Fire-wire hub.
  
• Lastly you'll need the Cheat Code.
  
• Start a 2-person multiplayer game.
  
• Press Start to Pause the Game.
  
• Enter the following code:
  
  LEFT, CIRCLE, LEFT, RIGHT, SQUARE, RIGHT.
  
  
• Your screen will say "Waiting For Other Players".
  
• The other three players should hit the start button and join in.
  
  
• ENJOY!!!