Released: 2000, Nintendo 64
Majora's Mask was a bit of an unconventional sequel to Ocarina of Time. Created out of the boredom Eiji Aonuma found himself in while directing Ura Zelda, the game had a rather unusual development.
Released in just over a year after its conception and planning phase with a relatively small development team, numerous ideas were tossed about and many didn't make it simply due to time constraints.
Substantial amounts of cut content ended up left in the game, such as items, textures, cutscenes, song data, player abilities, debugging leftovers, and so much more.