Prelude of the Chambered, a game by Notch.
It’s amazing because yesterday night I re-installed my old Might and Magic 3 to have a feel of old-school 3D. Prelude of the Chambered is more on the Wolfenstein side, but that’s a perfect timing.
Here, have a glimpse of how a real coder (not me) works:
Youtube link: Creating Prelude of the Chambered.
It should be quite possible to render Infiniworld with such a 3D engine. It’s actually one of my goals for Infiniworld 2 or 3 :].
Edit, later that evening:
I died, I was so close! I got lost on my way back from the temple, the ghost boss running after me while I had only 4 health points left. Now I’m scared.