Hard as hell for me to choose.....however, I must go with the SNES version of Chrono Trigger
https://jasonsvideogamessource.com/games/chrono-trigger/

Lord have mercy on my choice. I have to go with Super Mario Bros. I played this pretty much after the American console market collapse. SMB was the first game that made me fall in love with home gaming and fall in love with the NES as a kid. It's why to this day I have respect for Nintendo even if I dislike some choices they made over the decades. In my eyes, in 1985 as a kid they helped save the home console market. Them and SEGA.
Yea, some of you are older than I 🤣. Does Ocarina of Time count? After all, Nintey is making a remake.

Ninja Gaiden (NES) absolutely too brutal for any child to play


