I think I've only played the original D&D a couple of times. I've played Ad&D quite a bit more. A local professor, M.A.R. Barker, developed a game based on his Tékumel fictional universe, so we played a lot of that. And C&S, and Paranoia, and Morrow Project, and Star Trek, and Runequest....
Ah, good times.
Ah, good times.