Having been a VIC-20 fan for many years, I was surprised that I’d never heard of this game: Ultima – Escape From Mount Drash. It was never ported for any other systems (until recently) and only given only limited release for the VIC. Despite the name, it’s not a "real" Ultima game. They just tacked the popular name onto an already written game as a marketing ploy. I haven’t tried it yet, but it looks like a serviceable pseudo-first-person dungeon crawl. Not too bad considering the VIC’s limitations.