Softdisk Publishing released Commander Keen: Keen dreams in the year 1992. It's a very good science fiction action game, part of the Commander Keen series. Commander Keen: Keen dreams is protected, runs on DOS and can be played by 1 player.
status: protected (protected by its owner, usually a commercial game)
The cartoon-style platform games are notable for their pioneering use of EGA graphics and shareware distribution, and because they were some of the first games by id Software (which went on to develop blockbusters like Doom and Quake).