Happy mask buyers
You can sell all of the happy masks to these people:
Fox-looking mask (srry, cant remember the actual name): the guard that is at the exit of kakario village heading toward death mountain
Skull mask: enter the lost woods and go left (coming from behind mido's house) and jump onto the short log. play sarias song to make the skull kid friendly then talk to him with the skull mask on (you might have to use z-targeting). You will lose rupees on this deal, but its worth what you get later.
Scary mask: In the day, go to kakario graveyard and talk to the little kid walking around while wearing the mask. He'll buy it at regular price.
Bunny hood: Find the running man that runs all around hyrule field all day. Once you find him, keep up with him until its night (or play the sun's song). very little into the night, he'll stop and you can talk to him and sell him the mask. You should sell to him on an empty wallet, because he pays you so much for the hood that it fills your rupees to max!
After you sell all of these masks, you can take out the mask of truth (lets you talk to gossip stones), Zora mask, Goron mask, or Gerudo mask. Before you waste your time trying to take the gerudo mask to gerudo valley and gain access to gerudo fortress, i'd like to point out that gerudos aren't blind and a mask won't fool them.
Anyways, happy mask selling!
More tricks, tips and cheats for this game are right here - Zelda 64: Ocarina of Time cheats
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