Here are some cheat codes for Duke Nukem 3D (shareware v1.0)

NOTE :  ALL CODES ARE PRECEDED BY THE LETTERS   DN

      (DN)CORNHOLIO    -  God Mode toggle
          KROZ         -  God Mode toggle
          STUFF        -  max weapons, inventory, keys, armor
          ITEMS        -  max armor, inventory, keys
          SCOTTY##     -  warp to episode# level#
          VIEW         -  view mode toggle (same as F7)
          CASHMAN      -  throws money when you hit the spacebar (or open)
          COSMO        -  says "Register Cosmo Today"
          ALLEN        -  says "Buy Major Stryker"
          RATE         -  displays framerate
          BETA         -  says "Pirates Suck"
          HYPER        -  gives steroids
          SKILL#       -  change skill level#
          MONSTERS     -  respawns monsters
          XXXXXX       -  ?