The Ultimate Space Prison Demo is for version 1.3. It has 2 finished levels and 1 unfinished level. The file is 83KB in size. The file name is prison21.zip. It was released on July 18, 1996.

The Ultimate Space Prison has fair level design and gameplay. Levels 1 and 3 are supposed to be finished but have some areas that don't seem that way. Some rooms you can transport into have nothing in them. Save often because of some one way traps. There is a bat file for each level. I rate it as fair with 2 out of 5 stars.