I still rememner the time, when I knew almost every secret (or so I believed) in Commander Keen Goodbye Galaxy, and other pupils at school asking me to tell them secrets in levels they played after classes on a school computer.
Cool, but did you ever hear about and play BioMenace? Everyone always talks about Keen, but literally no one ever mentions BioMenace, which was built on the same engine as Keen. :(
BioMenace was on a computer of the parallel group (pupils were put into groups A, B, C, etc., who would have their classes separately). One of my best friends excelled at that game. I enjoyed watching him play it.
In hindsight, we were pretty lucky to have computers at that time at school. Even if old ones. Still have not found all of the games again on DOS game archives, that were on these machines.