00 Duke is a 1 level demo. It is for version 1.4/1.5 and the file is 2.3MB in size. The file name is 00duke.zip. It was released on July 11, 1999.

00 Duke Demo has good level design with nice textures and good gameplay. There are two new bad guys, one of them the Doom Marine. The number 4 weapon is now a modified chaingun from Doom and the health boxs are also from Doom. Plus the health boxs now are twice as strong. You are given two mission objectives at the start of the level which you must complete or you are sent back to the start. (But you get to keep your weapons!). I rate it as good with 3 out of 5 stars.