This will severely age me, but my first was playing pong a few times at a cousin's house. Years later I played some other, more fun, games at a cousin in laws house. I forget all the titles, I think they were, ms pacman, pacman, the first game with mario and donkey kong, whatever name that was. Maybe the first mario brothers. Think it was on the atari something system.
I remember finding ms pacman easier. And for some reason, did slightly better playing luigi in the original mario brothers. Thought I'm terrible at video games, I guess due to lack of practice, I still like them.