Mine is The Legend of Zelda: Ocarina of Time.
All the music, the atmosphere, the story. Just wonderful. Which one is yours?
Super Mario 64 best game ever on the Nintendo 64 that I still own and work.
1080 °
Ocarina of Time is definitely one of my top games then there would be Mario 64, Mario Kart, Pokemon Stadium and Pokemon Snap which I always played as a child! (Sometimes even today because of all the nostalgia)
OOT, Mario Kart 64 and Goldeneye.
Limiting it to just 1 game is impossible. I mean, when I was a child, I had Mario 64, Mario Kart, OoT, Mario Party, Donkey Kong, Banjo & Kazooie, Star Wars Racer, F-Zero X, etc. And I really liked them all.
Except for Star Wars Racer, I had them all too. But OOT has always been my favorite.