The Legend of Zelda: Ocarina of Time Master Quest

, commonly known as Master Quest, is a reworked version and game mode of. contains largely the same content as the original, but with redesigned, more difficult NaN Dungeons akin to a Second Quest.

was first made available for the Nintendo GameCube on a special bonus disc that also contained the original. This disc was given out in limited quantities with pre-orders of. Additionally, it was sold packaged with in some regions. It is also available as a mode in, unlocked after first completing the regular game.

Changes from
The most notable feature of is that every OoT3D: in the game has been modified to increase their difficulty. Though they feature similar layouts to the original game, the order of progression through the levels has been changed. NaN Enemies are spread differently throughout the NaN Dungeons, and tougher NaN Enemies are encountered much earlier on. Many of the rooms and puzzles in NaN Dungeons place a greater emphasis on time-limited NaN Switchs, manipulating NaN Time Blocks, and collecting NaN Silver Rupees. Some unusual changes exist, such as NaN Cows stuck inside the walls lining OoT3D: that double as NaN Switchs. In addition, some of the NaN Gold Skulltulas inside NaN Dungeons have been moved, and certain NaN Items that are optional in the original version are now mandatory to complete the game.

Version
for is not available from the start. To unlock it, the original quest has to be completed first. Upon doing so, the player will have an option on the Title Screen to choose between the original quest or the, with each version having its own set of Saved Games.

This version of the features the modified NaN Dungeons from the GameCube version, but has two significant changes. The entire game has been mirrored, similarly to for the Wii, making OoT3D: right-handed as well as flipping the entire OoT3D: map and the NaN Dungeons. In addition, all of the NaN Enemies and NaN Bosss will cause twice as much damage to OoT3D:, which also applies to the 's own Boss Challenge Mode.

History
In the late 1990s, Nintendo developed an add-on peripheral for the Nintendo 64 called the Nintendo 64DD. The Nintendo 64DD used magnetic disks, with a larger memory capacity than the cartridges used for the Nintendo 64, allowing for additional content and improved models and textures. While Nintendo hoped that the Nintendo 64DD would attract third-party developers, they also began developing several first-party titles, one of which was. Struggling to attract interest to the platform, Nintendo moved development of to the Nintendo 64, and the game was ultimately released on a cartridge. At the time of this change, the game featured more content than the cartridges could hold and so parts of the game had to be removed.

Shigeru Miyamoto announced that an expansion would follow, tentatively known as Ura Zelda, with meaning "flip-side" or "reverse". The expansion was purported to include rearranged OoT: from the original game. The Nintendo 64DD became a commercial failure in Japan, and so most of Nintendo's planned titles for the 64DD, including Ura Zelda, were never released. Miyamoto insisted that the game would continue to be developed, and in August 2000 indicated that Ura Zelda had been completed for some time. Despite this, Nintendo could not decide on how to release the game, and considered different methods such as a magazine tie-in.

Remnants of Ura Zelda's 64DD origins can be found in. Several error messages exist in the game's data regarding wrong disks being inserted. By modifying certain RAM addresses, a "Disk" tag can be made to appear on the OoT:, and any save file can also be flagged as a "Disk" save, becoming permanently grayed out and inaccessible. If the game is tricked further into thinking the expansion disk is inserted, attempting to open the file will crash the game, presumably from trying to load non-existent data.