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Eternall Invisability
This isn't really a cheat but an easier way to complete the game it works on any level: All you do is you don't shoot anybody or anything and they won't notice you. Also this will enable you to complete it on Nightmare mode Good Luck
[send by:Jammy] Cheat[quake killer(original)] Go to the pasword screen and enter all q's. it will say invalid password but do not woory, just exit the screen and go to the options screen. here you will find a listing for debug mode, enter it and you will have varios cheats including god mode and warp levels. enjoy....

Debug mode
Enter "QQQQ QQQQ QQQQ QQQQ" as a password and ignore the "Incorrect Password" message. Then, a "Debug" selection will appear on the option menu. Level select, all weapons, invincibility, and monster targeting may now be accessed.

No clipping mode

Enter "NOCLIP" as a password to pass through walls.