Cheat mode:
     Codes are unlocked by performing certain tasks during the game. A
message  with the code will appear to confirm successful completion of
the  task.  Codes  cannot  be enabled until they are first unlocked in
this manner.

Textureless mode:
     Hold [Backspace] and press 1 during game play.

One Shot Kill:
     Hold [Backspace] and press 8 during game play.

Bulletproof Lara:
     Hold [Backspace] and press 7 during game play.

Unlimited assault rifle ammunition:
     Hold [Backspace] and press 4 during game play.

Unlimited grenades:
     Hold [Backspace] and press 5 during game play.

Unlimited SMG ammunition:
     Hold [Backspace] and press 6 during game play.

Show enemy health:
     Hold [Backspace] and press 2 during game play.

Wield Excalibur:
     Hold [Backspace] and press 9 during game play.

Wield Soul Reaver sword:
     Hold [Backspace] and press 0 during game play.