The final Zelda game for the N64 (previously known as Zelda Gaiden as well as Mask of Mujula - The Japanese name) is more of a side story than a full blown Zelda game. It uses an advanced version of the Zelda 64 engine which also uses the 4mb Expansion pack for better visuals as well as bigger playing areas.
The game is packed to the brim with gameplay and some say it's as good as Ocarina of time - if not better!