CCheat mode:

* For  v1.0:
Type iamcheater at any opening screen or menu.
A clicking sound will confirm correct code entry.

Note: The code may need to beentered twice in succession.
Then, enter one of the following codes during game play or at any menu screen.
A clicking sound will confirm correct code entry.
 
Code Effect Code
showtheend View ending sequence
laracroft Alternate uniforms, including Lara Croft 
enemyf Enemy view from the front
enemyb Enemy view from the back 
playercoords Show coordinates in top left corner 
debugdrawwire Wire frame mode 
allitems All weapons with full ammo
resurrect Return as zombie after being killed 
goodhealth Full health 
nohits Invincible to hits 
Kill all opponents  killthemall
funnyhead Big head mode
gamedone Current mission ends successfully
gamefail Current mission ends in failure
openalldoor Open all doors 
quickload Load saved game of current mission
debugdrawvolumes Unknown 
* For v 1.1 :
Type in "iwillcheat" at any menu screen to enable to following:
 
Code Effect Code
nohits God Mode
goodhealth 100% health 
openalldoor Opens all doors 
allitems All items
killthemall Kills all enemies
gamedone Completes mission
funnyhead Big heads