This new 60 level set replaces the earlier shareware set on my page with the same title. It should be played with the registered set. I've not played the whole set thus far, but from what I've seen the standard is pretty high.
The difficulty level is similar to the original Wolfenstein 3D registered set, but it has futuristic graphics and a good layout.
Here's some screen shots of the game:
Each episode has a different title. These are as follows -
1) Nazi Base
2) Station Level
5) Western Wall
6) Parliament - levels 1 thru 8
6) The Lost Level - secret level
6) Colonel Welder - boss level
Download ASTROSTEIN here