Press [Alt] + during game play, type
garble and press [Enter] to enable cheat mode.
Then, press [Alt] + again, type one of the following
codes, and press [Enter] to activate the corresponding
cheat function.

Code
All weapons arnold
Super Uzi gun superuzi
Full ammunition slugs
Unlimited health willnotstop
Extra health surgery
"Hello?" message hello
Skip scene illbeback