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Nintendo 64 - The Legend Of Zelda: Majora's Mask cheats

Travel forward in time 12 hours:
Play this song with the Ocarina: C-Right, C-Right, A, A, C-Down, C-Down

Slower time / normal movement:
Play this song with the Ocarina: C-Down, A, C-Right, C-Down, A, C-Right. 
Repeat the song, to return to normal. 

Heal signs
Destroy a sign, Play this song with the Ocarina: C-Left, C-Right, C-Down.