Huh. Ysgarth's the only game mentioned so far I ever owned -- pretty much because I was a contributor to Alarums & Excursions for a few years in the early 80s, and I was collecting ideas for my ever-more-variant homebrew. That being said, other than homebrews, what's the most obscure forgotten game you ever played, other than homebrews? As far as I can recall, being on a playtest of Lee Gold's Lands of Adventure was likely it.