Polygon models, color lightings, etc. I can't handle pixelized sprites. :(
NOTE: You only need the .GRP file from any one of Duke3D Shareware, 1.3d or, 1.4/5 Atomic, in addition to the .EXEs from the binaries archive above. Use the included SETUP.EXE to configure the game to your liking. When first run, the game will ask if you want to extract the .CON files from the .GRP, which you should say 'yes' to.