Castle Magus

As far as Sanitarium goes, it's pretty dated and a bit clunky, but it was still pretty good, at least what I remember of it. That said, I played it once, somewhere between one and two decades ago (long before I mentioned it here, maybe even pre-LiveJournal), so I don't really remember too awfully much about it, other than it had a pretty screwed up story, in a good way.