I'll show my age here and say Super Mario Bros 3 or Super Ghouls and Ghosts. I spent many an hour as a child on these games and being able to play them on my Swtich is awesome.
My favorite childhood game as to be Yoshi's Island where you played as Yoshi and you would be taking care of baby Mario throughout the game. This was a game I believe wasn't as popular as many of the other Mario games but it was a lot of fun. I remember playing it with my Mum and my brothers and we would help each other out to get past levels. I made a lot of memories in my childhood playing that game and I am so glad I can still get access to it on the Nintendo Switch.
I am so glad that I played games when I was growing up. Whenever I remember those days, I will be fulfilled that I did. Sonic the Hedgehog, Street fighter and Mario are my favourites. They bring endless fun, excitement and adventure to me.