Multiplayer game without network:
Under DOS, you must type this command::
Duke3D /q[n] /a /m[n] is the number of players (between 2 and 8).
Cheat in Duke Matchs:
Know the position of the others players:
At the biginning of the game go in the options, and choose record a demo; after, go in the game, and when you touch the key [k], you will see all that the others players are seeing, like in co-op. Each time you will press the key [k], you will see an other player.
See throught the doors:
When you pressed the key [F7], you see yourself; place yourself behind a door and turn: you see the other side of the door.