To enter the cheat mode you have to press LEFT SHIFT + F11 then you can enter the next cheats:
Cheat Code - Effect
timeless - Stop Time
schneider - End Current Level
clint - Win Current Level
jackal - Ammunition
hollow man - Invisibility
show me all - Show All Objects
zeus - Help From the Gods
fidel castro - View Dialogs
medic - View Hints
powerman - New Weapon
epitaph - Toggle Victory Condition Display
whats my destiny - Toggle Display Short Briefings
