Press F11 and enter these codes:
ISITWENTY Shows all map
ISILETSBAIL Finish the current level
ISIWHEELS Get access to the X-car! (you must finish the level to get it)
ISIFATPACKED Gives you all the weapons, ammo & powerups
ISIQ God mode
ISISLEEP Freeze your enemy
Thanks to Revolution readers Pavel Spirine and Cory!