Yes, but you will not get the fierce diety mask.
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.
Obtain all normal masks. Then, have the giants stop the moon from falling. When on the moon, some...interesting people will take your masks when you play with them. When you don't have any more masks, talk with the guy wearing the majora's mask. No one wants to play with him. When you talk with him, he'll mention how you have no more masks to play with. Then, he gives you the infamous Fierce Deity Mask.
Once you do get it from the majoras mask kid in the moon you must defeat the majoras mask and you MUST watch the credits all the way to the end once it says THE END and the sarias song stops playing reset or turn off your N64 then reopen your file you will notice the mask will say 24, now check your masks notice there right in the bottom right corner is the fierce deity's mask.
The 5th dungeon is the dungeons on the moon. To get to them, you have to complete the 4 regular dungeons, go to the top of the Clock Tower on the night of the final day, and play the Oath to Order. There, you have to give masks to the children to access the dungeons. If you give them the 20 masks other than the Deku, Goron, and Zora Masks, you'll get the Fierce Deity Mask.
complete all four dungeons on the moon giving up all 26 mask. do this befor you fight majora
The imp will always have the mask, up until the end of the game. The imp will be on the Clock Tower, and then finally inside the moon. The mask is on the imp's face.
beat the game 2 times and erase 1 file and use it and u will come out with the deity mask, or collect every single mask and give them to the children dancing around the tree on the moon, then speak to the kid with the majoras mask. once you've completed all four dungeons you will haave the fierce deity's mask, but no other happy masks. play the song of time to get them back ^NOTE TO ALL: The beginning of this answer cannot be done. If you beat the game two times and erase file 1, it won't do squat. But the rest is legit.
Get all 23 masks go inside the moon to get the last after giving all your masks to the kids.
you will go back to where you last saved, so yes, you do get your masks back
In order to obtain the Fierce Deity's Mask you must complete each of the four mini dungeons on the moon by providing all the available masks at the time which are all except the Deku, Goron, and Zora masks. This must be done all at the same time otherwise you will not receive the mask from Majora the last moon child.
No. the children of the moon were there before I beat the game. But it would be a good idea to have collected all of the masks before-hand. Its very important that you do this.. Once you've gotten all of the masks, go to the moon, and talk to the kids in masks on the moon (all besides the one wearing Majora's Mask). Once you talk to them, you'll be transported to a new area, where you'll have to play hide-and-seek with them. If you win, you'll be transported back to the moon's surface. Beat every kid, and give each kid masks, and you'll be given the Fierce Deity mask when you talk to majora.
You must have every other mask in the game - this is crucial. Then once you enter the moon to fight Majora, you can see four kids running around a tree with the bosses masks on their faces. If you give them masks, you can play their games. You have to win ALL FOUR GAMES. Then you will be given the fierce deity mask. (once you save, you get all your masks back, and you get to keep the fierce deity mask).