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Yes, but you will not get the fierce diety mask.
You have to complete the tasks in it.
Yes, you get them all back after you defeat Majora's Mask.
There are 2 of these in termina inside you must destroy 30 spiders and receive there tokens(sound familiar) once you do a person will give you the mask of truth in the swamp spider house and in the great bay spider house you will get a bigger wallet.
A bottle.
complete all four dungeons on the moon giving up all 26 mask. do this befor you fight majora
there is no adults mask but there is a fierce deity mask. You get it by playing all of the kids games on the moon. Also you need to have all the masks in the game to get it, thats very important.
you get the big wallet (by getting all the gold squltillas in the ocean place) and get the all night mask and listening to her stories with the all night mask on
The Indigo-Go's i think
It should work on all versions of Majora's Mask
Sadly, there is no 'after-game' to the Majora's Mask. Once you defeat the game, the only thing left to do is collect all of the masks if you haven't already collected them all.
Beat all the side quests and dungeons. It will take playing the song of time a lot.