Postman’s Hat
The postman’s hat is obtained during the anju and kafei sidequest (see Anju and kafei sidequest), to obtain it you need to deliver kafei’s letter to the postman in west clock town on the final night. After you do that wait outside the milk bar until the postman comes out, then talk to him, after you have had a nice chat he gives you his hat. The postman’s hat is used to get a single piece of heart (see heart pieces) out of a mailbox.
Couple’s Mask
The couple is the couple’s mask which you obtain by completing the anju and kafei sidequest. The use for the couple’s mask is to gain a piece of heart.
All-Night Mask
The All-Night Mask can be purchased at the Curiosity Shop for 500 Rupees. It is only available on the Final Night, however, it will only be available for purchase if Link protected the old lady from bomb shop on the first night from Sakon during the same Three-Day Cycle, because it costs 500 rupees you must need the giant wallet (see item upgrades). The all-night mask is used to gain two heart pieces.
Bomb Mask
The bomb mask is obtained in Northern Clock Town at Midnight on the First Night, the Old Lady from Bomb Shop gets robbed by Sakon the Thief at approximately 11:15. Link can simply slash at the bag to save the Old Lady, who rewards Link with the Blast Mask. The blast mask is used for when you don’t have bombs, it will blow up and give you half a heart of damage.
Stone Mask
The stone mask is obtained by giving an invisible guard -which you can see with the lens of truth (see items)- a red potion. The guard is located in the middle of the pirate fortress next to the giant wooden pole. After giving him the potion he will reward you with the stone mask. The stone mask make so enemies and people can’t see you.
The Great Fairy’s Mask
The great fairy’s mask is obtained when Link gets the stray fairy (see Stray Fairies) from the Laundry pool during the day or in east Clock Town floating around. When the stray fairy is obtained go to the Northern Clock Town and go to the hole in the right wall. The great fairy’s mask attracts stray fairies in temples.
Kafai Mask
This mask is obtained by going to to mayor´s place (which is located in west clock town) on the first or second day. As soon as you walk in you need to go into the right door and talk to madame aroma to obtain the mask. This mask is used to gain information on the missing Kafai.
Breman Mask
This mask is found in the laundry pool on the first or second night. The way you get is you have to talk to a man sitting on a log in the laundry pool, after he tells you his sorrows you will get the breman mask. This mask is used to march and lead chickens to get another mask.
Kamaro's Mask
This mask is obtained by healing Kamaro´s sorrows. The way you do this is by finding him the on the largest mushroom in north termina field. The talk to him he will tell you his story, after he tells his story play the song of healing to obtain Kamaro’s mask. When you press ”B” with Kamaro’s mask on you will start dancing.
Bunny Hood
To get the bunny hood you need to go to Romani Ranch,Romani Ranch becomes accessible on the Third Day. However, if you have a Powder Keg (See items) , you can blast away the rock that is blocking the pathway, allowing you to enter on the First or Second Day. To get the mask, go to the Cucco Shack at the back of Romani Ranch and use the Bremen Mask to parade the ten baby chicks around. If you get all of them, they will one by one grow up to full blown Cuccos. Once they are all finished, you will receive your prize. The bunny hood makes you run twice as fast and thus make you jump twice as far.
Keaton Mask
The keaton mask can be obtained in the Anju & Kafei sidequest. This mask lets you take a quiz, and if get the questions right you get a piece of heart.
The Mask Of Scents
After you complete Woodfall Temple capture the Deku Princess inside an Empty Bottle and take her to the Deku King. As thanks for rescuing the Princess, you will now be able to play a mini-game with the Deku Butler. Exit the Deku Palace and hope across the lily pads that are to the west of the Palace. Inside, speak with the Butler to start a race. If you can reach the end, you will be rewarded with the Mask of Scents. This mask lets you sniff out mushrooms, when you get mushrooms you can take them to Kotake for a blue potion.
The Mask Of Truth
The Mask Of Truth is obtained by finishing the swamp spider house (see Spider Houses). This Mask lets you talk to small animals by picking them up, also it gives you the ability to talk to gossip stones.
The Don Gero's Mask
After the Elder's Son has been put to sleep, the torches in the room will light up. Use a Deku Stick to light up all the remaining torches found within the Goron Shrine. This will cause the chandelier at the top of the Shrine to start spinning. While wearing the Goron Mask, roll off the ledge while at full speed and break one of the pots on the chandelier. One of the pots will drop some tasty Rock Sirloin. Grab the Rock Sirloin and walk it all the way back to Mountain Village. Toss the Sirloin up to the shivering Goron atop the ledge. He will eat it and have the strength to get home. As thanks, he will give you the frog-like mask he is wearing. This mask is used to get the Frog Band back together.
Romani’s Mask
On the First Night, speak with Romani and come back at 2am on the First Night to fend off "Them". After saving Romani Ranch from "Them", you can hitch a ride with Cremia at 6pm on the Second Night, heading to Clock Town. Along the way, you'll have to take a detour and defend the cart against thieves (the Gorman Brothers in disguise). Upon successfully making it to Clock Town, Cremia will thank you by giving you the Romani's Mask. This mask will give access to the milk bar in Clock Town
Garo’s Mask
Play Epona's Song and ride Epona to the Gorman Track. Speak with the Gorman Brothers and they'll challenge you to a race. Beat the two brothers and you will be rewarded with the Garo's Mask. This mask, along with the Hookshot, allows you to reach the southern portion of Ikana Canyon. In certain areas around Ikana, it will also cause Garos to appear. Defeat them in duels to get hints.
Captain’s Hat
After getting Epona, you can enter the Ikana Valley and reach the Ikana Graveyard. Next to Dampe's House, there is a giant skeleton. Play the Sonata of Awakening to awaken Captain Keeta. Shoot him with an arrow to stop him in his tracks and chase after him to battle with him. Once he is defeated, run up the trail and speak with him. He will then grant you the contents of the chest behind him. After he disappears, jump to the other side using the Bunny Hood, the Zora Mask, or get as close as you can and Hookshot to the chest. Open it for your prize, the Captain's Hat. Wear this to speak with and command the warriors of Ikana, including the Stalchildren. You can also use this mask in rooms where there are ReDeads and they will start to dance around, making them very easy to to slash them.
Circus Leader’s Mask
This mask is got when you play all your instruments at once. This is done when you talk to Toto (the giant fish) after you talk to him transform to all your characters and he will tell you where to go and to play a part of song, do this for all characters. After you’re done with all this Gorman will cry and give you his face as a mask. This mask can be used to start a quest, but the best part about is that it cries manly tears.
Gibdo Mask
This mask is obtained by healing Pamela’s Father. You get to him by playing the song of storms next to the river in Ikana Canyon this will cause the river to fill up with water and the music box will also start up when you do this. After this place a bomb next to the front door, when the bomb explodes Pamela will come running out to check out the noise when she comes out sneak in her house. When you’re in the house go downstairs, when you do Pamela’s father will come out of the closet, when he does you need to play the song of healing. When you do his face will fall off as a mask. The gibdo mask makes gibdos not target you, you can talk with gibdos too with this mask.
Giant’s Mask
In the Nintendo 64 version, you acquire the Giant's Mask after defeating an Eyegore in a room just before the dungeon boss. In the Nintendo 3DS version, you acquire the mask midway through the boss battle with Twinmold, after defeating the first of the two Twin Molds. Wear this mask and you become gigantic! It costs Magic to wear though, and can only be used in the desert area in which you battle Twinmold.
Deku Mask
The deku mask is gotten when you obtain the ocarina of time and you return time to the first day. When you go back to the first day go backwards into the giant doors, when you're in there talk to the Happy Mask Sales. He will teach you the song of healing, when he is teaching you the song of healing your deku face will fall off onto a mask. The deku mask can shoot snot bubbles, he can also fly with the help of a deku flower, but he will instantly die when he is lava or underwater.
Goron Mask
The goron mask is gotten when you see the dead Darmani with the lens of truth (see items upgrades). After you see him talk to him, when you're done having your chit-chat follow him. When you reach the large mountain he will fly up there, so then you have to pull out your lens of truth and look at the mountain. You will see a ladder, climb to the top and enter into Darmani´s grave and heal his sorrows with the song of healing, again his face will fall on the floor (I´m sensing a trend here). The goron mask lets you have a strong punch attack, he is also immune to lava, the best part about the goron is that he can roll, while he is rolling he will use magic and he will send out spike off his body. But he will drown and sink like a rock in water.
Zora's Mask
The zora's mask is gotten in Great Bay. To get it you need to get Epona to get over the fence, look into the ocean and you should see a lot of seagulls swim over to them in Link Form. You will see a man-fish thing grab him and bring him to shore. He will tell you his sorrows, heal his sorrows with the song of healing. Then his face will fall off again. While being a zora you can swim like Michael Phelps, you can also put electricity around you (electricity plus water doesn't seem like a good combo). The zora won't instantly die in anything, he will just get ticks of damage in lava.
Fierce Deity's Mask
This mask is obtained when you get every mask and you play with all the children running around, after you've done that talk to the kid with Majora's mask on. He will notice you have no masks left and then you he will give you Fierce Deity's Mask. With this mask you turn you a boss, this mask let´s you have the most powerful sword there is, the sword will also shoot laser beams when you're at full health.