Descent 1&2 I was 10 yrs old when the Descent 1 demo came out in '94. And my endeavor into gamedev started when the mod team I was on (Midnight Squadron) tried to make a Descent 4 mod with Descent 3. Was torpedoed by Parallax, but that spark to build worlds never left. I still play D1/D2 on occasion.
The first game I ever played was Wolfenstein 3d. Thais right the original. I wasnt yet old enough to sit in the chair and reach the keys so my grandfather (who never got to fight in WWII and always wanted to kill some nazis) would help me play and we would take turns. This more than anything made me want to be in gamedev