Deus Ex is long before Vidya became mainstream. Furthest thing you could get from pop culture.
I hate to participate in the derailing, but let's look at some other rare, hidden gems from long, long, ago when video games were only viewed as a stupid baby toy for babies, before Deus Ex even.
You probably never heard of this game unless you're a real videogamer, it was known as Doom, from 1993. It was a little known PC release.
Two more hidden gems from a little known company called Nintendo came out even earlier than Doom, they were known as Zelda and Metroid and came out in 1986.
This tiny company would go on to produce more rare titles in the 90's, one was called Mario 64, but it failed to crack the charts.
If arcades were more your thing, if you were lucky you might stumble upon one of a very lucky few 7-11's or Shopping Malls that had the privilege to carry their very own Street Fighter II arcade in 1991.
The very next year, another company called Midway released an arcade game that had the novel idea to put blood and violent executions in their fighting game after each match. Despite this unorthodox approach, the game failed to draw much attention from anyone. Somehow, this little known IP got released on 800 different home consoles and got a movie in 1995.
That company I brought up earlier actually released another system called Nintendo 64 in 1996 and had a weird, little known title called Goldeneye 64 but nobody played that so I wasn't even gonna mention it.