God mode:
Enter Right , Left , Up , Down , A , Right , Left , Right , Left during game play.
All weapons:
Enter Right , Left , Up , Down , A , Up , B , A during game play.
Full health:
Enter Right , Left , Up , Down , A , Up , Down during game play.
Nailgun mode / Toggle gravity:
Enter Right , Left , Up , Down , A , Left, Left during game play.
SMG and 9mm Pistol SD:
Enter Right , Left , Up , Down , A , Up , Right, Right during game play.
Slow motion:
Enter Right , Left , Up , Down , A , Up , Left during game play.
Punch mode:
Enter Right , Left , Up , Down , A , Up, Up during game play.
Megaforce mode:
Enter Right , Left , Up , Down , A , Right, Right during game play.