Underworld developer here. We certainly started it before we got the deal with Origin, but a lot of the design was done afterwards with the fact that it was an Ultima in mind. I'll grant that its Ultima-ness was thinner compared to many of the games with Roman numerals on them.
Ultima Underworld II, of course, was designed to be an Ultima game from the start.
Ultima Underworld II, of course, was designed to be an Ultima game from the start.