Press Ctrl + F11 to access to the Console found in the bottom left corner.
Now enter the following codes, then press enter and hit Ctrl + F11 again
BIONICWOMAN - Jump high, but run slow
INVUL - Invulnerablitly
LOC - Location coordinates on World Map
GORE 2 - Enhances level of blood
DINOS - Freeze Dinos in tracks
BONES - Draws bounding volumes for all physical objects
WOO - Unlimited ammo
TNEXT - Transports you through important locations on the level.
WIN - Ending movie
At the Start screen, hold Ctrl+Shift+Q+W. Then release W.
Thanks to Revolution readers Michael Patten, Dan Barbeau, Grant, and Dave!