While playing the game, enter one of the following codes.

Code	Effect
navlevel[mission x][level xx]	Level select.
nvablood	All weapons.
nvaclip	Toggle clipping mode.
nvadebug	Debug mode.
nvagod or nvacaleb	God mode.
nvamatt	Unknown.
nvarate	Change game speed.
nvashowmap	Full map.
nvduke	Toggle radio.
nvunlock	Toggle all locks.