Program data from The Legend of Zelda: Ocarina of Time has revealed information seemingly related to "Master Quest." Multiple "MQ" markers and related strings provide clues that this mode existed within the project, but there is currently no proof that it will be made available to players.
Images released by MrCheeze show multiple data entries marked with "MQ" next to "DodongoCavern." Executable file strings later disclosed also include "HasMQ," "IsMQModeExist," "NewGameMQ," and "ReleaseMQ." These names may be related to Master Quest, or they could simply be remnants left over from the development process.
Master Quest previously appeared in the GameCube and Nintendo 3DS versions, featuring redesigned dungeons that offered a higher difficulty for players familiar with the original layout. When producer Eiji Aonuma was recently asked if Master Quest had been considered for the Switch 2 remake, he only stated that no specific information would be announced at that time, without confirming any plans.
The available data still cannot confirm whether Master Quest will be released, nor can it determine if it might come as a free update, paid DLC, or in some other form. Nintendo has not announced any related DLC, and it remains unclear whether these strings are development leftovers or part of undisclosed content.