Found this article on the game, Descent. This game was a pioneering first person shooter that gave you complete three dimensional movement. I used to play the crap out of this game against my uncle on Microsoft’s Gaming Zone (Pre- Live service).
Still playable if you know how to use DOSBOX, and you might be lucky to find the version released for the original Playstation (though it pales in comparison to the PC versions).
Awesome gem and a great article!