Various cheat codes found around the Internet.
Pause the game and type in the code.
dnbarney - Will change every bad guy to barney!
DNBETA - "PIRATES SUCK!"
DNCASHMAN - 'Open' tosses Money (toggle).
DNCLIP - CLIPPING: OFF / ON
DNCOORDS - Shows current map coordinates.
DNCORNHOLIO - GOD MODE: ON / OFF - Sets Health at 100%.
dngodly - God mode on.
DNKROZ - GOD MODE: ON / OFF - Sets Health at 100%.
dnungodly - God mode off.
dncosmo - Let's him say buy cosmo's cosmic adventure.
dncrosshair - Crosshairs appear to help you aim.
DNDEBUG - Debug information (toggle).
dnending - Ends the episode.
DNHYPER - STEROIDS - and Night Vision Goggles.
dnammo - Full ammo.
dninfinity - Gives you unlimited ammo.
DNINVENTORY - GOT ALL INVENTORY
DNITEMS - GIVING EVERYTHING!
DNKEYS - GOT ALL KEYS
dnlots - Gives you unlimited ammo, jet packs, etc.
DNWEAPONS - GOT ALL WEAPONS/AMMO
DNSTUFF - GIVING EVERYTHING! - including all weapons / ammo.
dnmajor - Everlasting jetpack.
DNMONSTERS - Monsters off / on.
DNRATE - Show frame rate.
DNSCOTTY### - Warps you to Episode # Level ## - with no inventory.
dnwarp## - Jump to other episode and level.
DNSHOWMAP - SHOWMAP: ON / OFF
DNSKILL# - Restart the level at Skill# - 5 is Damn I'm Good, 0 is no monsters or items.
DNTODD - "REGISTER COSMO TODAY!"
DNUNLOCK - ALL LOCKS TOGGLED
DNVIEW - VIEW MODE ON / OFF - Same as F7.
scotty30-12------90 - Skip Level
Cheat codes don't work in DukeMatch or Damn I'm Good.
Use the DNCLIP cheat and walk through a mirror to enter the 4th Dimension.
In E1L1 after opening the movie screen curtains face the movie projector, type dn1984 then watch the movie. It's supposed to be some commercial or something.
Type DNSKILL5 then type dn to get special powers.
Press ESC - Q - Y to skip the current Duke session.
Only Superman can out-fly a bullet.
Duke can stand on top of just about anything, even if it's moving...
Know when to jump, know when to strafe and always run.
When Duke gets captured they only take all his Items and Weapons/Ammo.
Some switches can be shot, but you'll need to use mouse aiming (U), or Home/ End to hit them.
Ducking before falling hurts less.
Some things blow up real good: cracks in walls, bridges, manholes, trash cans... even through force fields.
One of Duke's weapons can slow his descent.
A couple things bounce straight off mirrors
All of Duke's Pipe Bombs use the same trigger.
Duke can kick with both feet.
Water is good stuff! Mmmm!
Duke can jump some while swimming in streams.
Teleporters transport all kinds of stuff.
The Holoduke can follow you around like a shadow, change your key config.
Night Vision helps you to target hyper guys.
Duke can out-run the effects of the Shrink-Ray.
Fire extinguishers are only good for one thing, and it ain't putting out fires.
On the other hand, a fire hydrant is good for something else. After all, the plumbing works.
There's more than one way to set off a Lazer Trip Bomb.