Unreal Tournament Cheats

All you have to do is grab the anti-grav boots ( near the beginning of
the level ) and with them jump on the carriages , you should find a hole
, drop down and hit the switch to open the door then stop the train .
This code is useful if the enemy keep knocking you off the side of the
train because you miss all the gunfights 

Enable the "Invincibility" code when in the Face's Of World level for capture the flag. Get the Redeemer from the middle of either castle. They are found on the left hyper link. Then enable the "Maximum ammunition" code to get 999 Redeemers. Fall out of space and you will not die. Just press R2 to shoot the controllable rocket.

To get all ammo pause the game and press:
left, right, circle, circle, circle, right, left

Save the game and returnto the main menu. Slect the 'Resume Game' option, then highlight the previously saved game and press:
Up, Down, Down, Up, Left, Up, Right, Down

There are 2 levels I know with it in deck 16 and liandri in deck 16 drop down where the slime is you will see a blue light walk into it and you have it. In liandri go to the top of the tower then go across the bridge keep following the path see the vials go left go up the grate and it's there

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.


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.

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.

Level Advance
While you are playing a level you can hit pause and press:

UP, DOWN, LEFT, RIGHT, RIGHT, LEFT, CIRCLE.

By performing this code you will instantly complete the level and charge on to the next.

Unlock Every Level
To enable this code you must first play the game and create a save. From the Main Menu select Resume Game. On the Next screen highlight your save and enter the following code:

UP, DOWN, DOWN, UP LEFT, UP, RIGHT, DOWN.

If you entered the code correctly the screen will automatically change to the level select screen. It'll show you that every Level on every Ladder has been opened and is now accessible.