Legend of Zelda: Majora's Mask
The gameplay involved the same dynamic 3D environment as previous games in the series, but it was structured differently. The storyline placed the player in an alternate reality called Termina (not in Hyrule as in previous games) where a mysterious mask-wearing imp had caused multiple problems, not least of which was the moon due to crash onto the planet in three days. The player lives these three days over and over again, collecting items and knowledge, attempting to prevent this catastrophe.
Masks, which had first appeared as a side quest in Ocarina of Time played an important part in the game. Many of the 26 masks were necessary in order to progress through the game, though it was not required to collect them all.
The music was composed by Koji Kondo. (with the exception of the boss battle, middle boss battle, and battle music which was composed by Toru Minegishi)