A long time ago, back during the Nintendo 64 era, Ura Zelda (along with Zelda Gaiden) was a Nintendo 64 Disk Drive expansion disk designed for The Legend of Zelda: Ocarina of Time. However, due to the failure of the Nintendo 64DD, the games were never released, and the idea of Zelda Gaiden became The Legend of Zelda: Majora's Mask.

Ura Zelda means "Another Zelda". Supposedly the map was completely different, the temples were harder, and Link looked slightly different than Link. But still, this is an entire game we're missing out on.

Now instead of having people online make a modification for Ocarina of Time in their spare time (get it?), why not have Nintendo make an actual game, since they were nice enough to remake both Ocarina of Time and Majora's Mask for us?