NES at my first neighbor friend's house. Kindergarten maybe? Mario Bros. and Super Mario Bros.
Duck Hunt also but the parents wouldn't let me use the light gun since I was only like 5 and I was always trying to take things apart. (friends were a few years older)
We didn't have enough money for our own system until 1993 or so and got a Sega Genesis first, with Sonic. We tried it for a bit, didn't like it, took it back and got an SNES with Super Mario All-Stars. Came with Super Mario 2 and Super Mario 3 that I played a ton of. Only other game we actually owned was Super Mario World. Played a bunch of other games that I just borrowed from my friends like F-Zero, Star Fox, Mario Kart, Mortal Kombat, Zelda: A Link to the Past, and Super Metroid.