Ocarina of Time hack allows co-op multiplayer feature - Zelda Universe

Ocarina of Time is a game that can easily be broken into and the features simply changed to the user's liking. r Spinout182 has recently created a hack which allows up to four Links to play in a cool co-op setup at a time. Up to four friends can play together through the adventure of

Triforce - Wikipedia

You Can Now Play Zelda Ocarina Of Time In Co-Op

Hyrule Blog - The Zelda Blog: August 2011

Zelda - Zelda Ocarina of Time Online Multiplayer - Co-Op