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).
You Can't. Feirce Deity's mask is only for Boss battles Ie: Major, Gyorg, Odalawa. You cannot where it outside of a boss battle.
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 can't really get majoras mask even if you could you would get it by the time the happy mask guy wants it back
No majoras mask is the second ocarina of time
You don't really get it
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.
Guess directions its random usually it goes right, left, right, right.
There is no mask titled 'Cafe Mask' in Legend of Zelda: Majora's Mask.
You get Romani's Mask.
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.
It's in the fourth temple.