24 Jun 2004, ID#1915 Weapons,cars, missions, invincibility
Editor's note: I wasn't going to add these as I'm not sure if they work, so I thought I would let you guys give them a try seeing as the game is now out... If you try them please come back and either verify or bogus alert this submission please!
On the main menu select options, then extras.
Each line gives a different cheat but i type them all in at once so I do not know what each one is on its own.