Not quite sure. I think probably a Binatone TV Master pong-type game. They were all the rage in the late 70s, when I would have been around 5-6. I got my first Sinclair Spectrum in 1983 (I think) and got a strategy game called "Battle of Britain" for it - I think that was my first game. Then 3D Tanx and a Psion game called "Planetoids" that contained a game called "Missile" on the b-side. First FPS I can recall was "Transylvanian Tower", I think. First game that made me really think "wow" was Elite, and the first with a convincing world, mercenary (which was just amazing for the period) or Turbo Esprit - which was the precursor to GTA (lol). Also had a bunch of those hand-held games, Pac Man 2, Space Invaders and a couple of game-and-watch things. Loved the 3D SkyFighter game - a very early precursor to the vive...
Loved gaming ever since. Although I went through a period in the 90s of burning out on computing for a bit (no money, no girlfriend, had other things in my life) around 96-98 before picking it up again gradually over the years. Probably a very poorly timed sabbatical, as it was about this time that the internet moved computing from nerds and geeks to mainstream entertainment and geeks started to get girls