I am replaying UW1 right now. It feels reasonably new because the last time I played it was around 1996. It hold up very well, although the levels are much smaller than I remember. Also, for all the touted "survival" elements, the dungeon actually overloads you with equipment right from the start, so the real thing that matters is amassing ridiculously large equipment stashes and treasuries on multiple levels. On the other hand, its puzzles are still as inventive as they were back then.
After UW1, I will follow it up with Arx.![]()