Here's another series of articles on reverse-engineering a DOS game, using the original toolchain as part of the process of decompiling it: https://neuviemeporte.github.io/category/f15-se2
What I find most fascinating is that reverse engineering these kind of games is very satisfying and even more fun than playing them.
Although he moved on to search-based research, and sadly died, there are still mirrors out there of the old content, frozen in time.
https://www.darkridge.com/~jpr5/mirror/fravia.org/academy.ht...
So many famous people started their path there.