The Legend of Zelda: Ocarina of Time
I've played it on the N64, Gamecube and 3Ds. I have also played the Master Quest versions on the Gamecube and 3Ds.
I love the story and all the dungeons. This is my favourite Zelda game. Second place goes to Twilight Princess.
I like the 3Ds version of the game but it's a bit TOO easy because it makes marks on the map telling you that you have something important to do in that area but not saying what. It can be helpful in some ways but it's a bit too easy.
If Ocarina of Time ever came out in graphics like FFXV (PS4) I think I would die. I would love to see any Zelda game actually with PS4 graphics.