Cheat Mode
Type the following codes while playing.
DNWARP[E][L] - Skip to another episode and level.
DNCOORDS - All the coords
DNSHOWMAP - The whole map where you can see the secret places.
DNVIEW - Look outside of Duke's body (type dnview again for regular mode).
DNITEMS - Gives you all inventory items and keys.
DNCASHMAN - Duke throws around mass amounts of money!
DNSKILLSx - Changes the difficulty mode to x (x can be 0 to 3).
DNALLEN - Prints the message "Buy Major Stryker".
DNBETA - Prints the message "Pirates Suck!".
DNUNLOCK - Unlocks doors.
DNRATE - Shows frame rate.
DNHYPER - Steroids.
DNKROZ - God mode.
DNCLIP - Walk through walls and doors.
DNUNLOCK - Unlock all doors in level.
DNMONSTERS - Makes monsters dissapear.
DNKEYS - All keys.
DNSTUFF- All keys, ammo, health.
DNCORNHOLIO - God mode.
DNSCOTTYxxx - Warp to a specific level (xxx-means episode and level).
DNKROZ - God mode and unlimited jet pack.