[Ydiss]

I think I got you all beaten (except maybe one or two) on oldest game played on oldest system:

"Punchy" on the Commodore 16 (16, not 64 heh). It's a left-right platformer (one of the first ever on home computers) where you run across the ramparts of a castle and you have to jump the gaps and avoid archers and so on.

Z and X to move and the Commodore key to jump, lol. It came with the computer. I must have been no older than 7-8 (so that's around 1985).

Ahh the days.