Nuclear Winter Demo is a 1 level demo. It's for version 1.3. The full version has 6 levels. The file is 5.1MB in size.
The file name is nwdemo.zip. It was released in December 1997.
The Nuclear Winter Demo is a remake of Duke Nukem 3D episode 1 level 2. It has good level design and gameplay. The twist
is that you play episode 1 level 2 backwards. I rate it as good with 3 out of 5 stars.