It's one of the first 3D games ever, Wolfenstein.
Ran on 486 chip PCs with 8Mb RAM, I still have a copy.
( ,
Sun 11 Apr 2010, 14:06,
archived)
Apparently
the same level of 3D had been achieved 7 years previously:
en.wikipedia.org/wiki/Alternate_Reality_%28computer_game%29#Technology
...but was hidden by only turning at 90 degrees lol
( ,
Sun 11 Apr 2010, 14:48,
archived)
en.wikipedia.org/wiki/Alternate_Reality_%28computer_game%29#Technology
...but was hidden by only turning at 90 degrees lol
interesting...
www.eobet.com/alternate-reality/ has screenshots
( ,
Sun 11 Apr 2010, 14:59,
archived)