Extra Songs
Song of Soaring - With this song, you can travel instantly to any owl statue that you've hit with a sword. It's pretty hard to miss it, too. To learn it, go to the entrance to Woodfall - not in Woodfall, but on a ledge in the swamp overseeing the entrance to the Deku Palace. Dive into the Deku Flower and fly right towards the next ledge. Read the inscription on the stone, and you'll have learned the song. (In case you're confused, read the stone that Kaepora Gaebora is sitting on the first time you meet him.)
Scarecrow's Song - To learn the Scarecrow's Song, simply visit the scarecrow at the observatory and play eight notes for it. Now you can summon the scarecrow at certain areas, which can help you with many of the side quests.

The Razor Sword/Gilded Sword
The Gilded Sword is the best sword in the game (that you can equip to B). It is made of gold dust, and will never break, weaken, or disappear when you travel back in time. To get it, however, you will need a Powder Keg, 100 Rupees, and some gold dust. On Day 1, defeat Goht so that spring returns to the mountains. Go to the Mountain Smithy (the only house in the entire place, you can't miss it) and have him upgrade your sword for 100 Rupees. It will be ready at 6:00a.m. on Day 2. In the meantime, use a Powder Keg to destroy the boulder blocking the entrance to the racetrack. Agree to race once inside, and get first place. You will be awarded a new bottle with gold dust inside. When the dawn of the second day arrives, go to the Smithy and get your new sword, the Razor Sword. Don't think about stopping now, as if you travel back in time you will have the Kokiri Sword back. After recieving your new sword, talk to the Smithy again. He will ask you for some gold dust. At this point, pull out the bottle, and let the upgrading begin. At 6:00a.m. on Day 3, visit the Smithy yet again for a brand new Gilded Sword, which won't disappear in time, won't break, and is three times as powerful as the Kokiri Sword.

Keaton's Quiz
To get one of the Heart Container Pieces you have to pass Keaton's quiz. Below are all the questions Keaton could ask and the answers to those questions.
1. What time does Romani, the girl at the ranch, go to bed? Eight
2. At what time does Romani, the ranch girl, wake up? Six
3. How many balloons does Romani use during practice? One
4. What weapon does Romani use in practice? Bow
5. What is the name given to you by Romani? Grasshopper
6. What is the name of the song that Romani teaches you? Epona's Song
7. How many cow figurines are there in Clock Town? Ten
8. How many cows are there at Romani Ranch? Three
9. How many cuccos are in the barn at Romani Ranch? One
10. Where does Cremia try to deliver her milk? Milk Bar
11. How old is Tingle, the map salesman? 35
12. What are the magic words that Tingle created? Kooloo-Limpah!
13. Is Tingle, the mapmaker, left-handed or right-handed? Right-handed
14. What color of trunks does Tingle the mapmaker wear? Red
15. What is the name of the festival held in Clock Town? Carnival of Time
16. What is the name of the mayor of Clock Town? Dotour
17. What is the name of the vintage milk at the Milk Bar Chateau Romani
18. What is the name of Clock Town's inn? Stock Pot Inn
19. What bad habit does Anju, the innkeeper, have? She's quick to apologize
20. What is Anju, the innkeeper, bad at doing? Cooking
21. What is the name of Anju's father? Tortus
22. Who is the leader of the Bombers gang? Jim
23. Once it's completed, how tall will the festival tower be? Four stories
24. How many mailboxes are there in Clock Town? Five
25. What does the owner of the Bomb Shop call his mother? Mommy
26. What is the name of the singer in the Indigo-Go's? Lulu
27. How many members are there in the Indigo-Go's? Five
28. Mikau is of which race? Zora
29. Darmani is of which race? Goron
30. What instrument does the Skull Kid play? Flute

Extra Cinemas
There are five hidden movies in Majora's Mask.
1. While fighting the two skeletons at Ikana Castle, wear the Captain's Hat. When you've defeated them both, you will fight Igos du Ikana. Get close enough to the skeleton leader while wearing the Captain's Hat to make it believe you're Captain Keeta. After a little while, Igos realizes who you are, and continues fighting.
2. This isn't really a movie, but it'll do. After getting the room key from the Stock Pot Inn, be in your room on Day 2 at 9:00p.m. Go to the crack in the wall (where Tatl flies near and turns green) to eavesdrop on Anju and her mother.
3. Finish Cremia's notebook entry. Afterwards, she may give Link a big hug, but this is entirely random.
4. If you go to the Curiosity Shop at 12:00a.m. on Day 2, you can eavesdrop on a conversation between Sakon and the Curiosity Shop owner.
5. When you've defeated the Gibdos outside the Music Box House, go downstairs and walk towards the closet to get Pamela's father to come out. Instead of playing the Song of Healing, run up to him.

Other Hidden Stuff
Along with hidden cinemas, there are also several other things that you may not have noticed.
1. If you need 100 Rupees fast, go into the Bombers' Hideout and turn left instead of going straight. Bomb the cracked wall to reveal a hidden treasure chest.
2. After midnight on Day 3, visit the Mighty Training Center in West Clock Town. Hit the wooden panel behind where the sword master used to sit to find a secret room. The sword master will be hiding on the right side of the room, afraid for his life.
3. There are Rupees hidden everywhere in the game. Try everything to find them, including hitting targets like the ones outside Honey & Darling's shop with arrows, or by hitting the lanterns in Ikana Graveyard.
4. When you have the Mask of Scents, go to the room on the second floor of the Stock Pot Inn. Notice the shorts on the bed.
5. If you wear Kamaro's Mask in front of the scarecrow, it'll start dancing.

Weapon Upgrades
Arrows (max: 50)
1. Get a perfect score of 2,120 at the Swamp Shooting Gallery.
2. Get a perfect score of 50 at the Town Shooting Gallery.
Bombs (max: 40)
1. Stop Sakon on Day 1 at 12:30a.m. and the big bomb bag will be available at the Bomb Shop.
2. After giving the Deku Scrub at Goron Village the Swamp Title Deed, go back to the swamp and visit the Deku Flower. The Scrub will give you the biggest bomb bag in exchange for your old one and 200 Rupees (this one must be done last).

The 6 Bottles
1. You get the first bottle by helping Koume in the Woods of Mystery. This is the only bottle you must get.
2. Win first place at the Goron Race to get a bottle with gold dust inside.
3. Finish Romani's notebook entry.
4. Race both of the beavers at Waterfall Rapids. To get there, walk towards the waterfall at Great Bay Coast. When you see a log on the beach, jump on it and look up for a ledge to pull yourself up to with the hookshot. Move from ledge to ledge to reach the rapids.
5. On Day 3 after 6:00p.m., order the Stalchildren in Ikana Graveyard to destroy the grave. Remove the Captain's Hat, and talk to Dampé. Get him to follow you and dig up mounds of dirt. When a Poe appears, defeat it and a treasure chest will appear. Inside is the bottle.
6. Deliver the "express mail to mama" that you get on Day 3 from the Curiosity Shop owner to Madame Aroma in the Milk Bar. You will get a bottle filled with Chateau Romani, a drink that gives you unlimited magic.

Song List
Song of Time - C→, A, C↓, C→, A, C↓
Song of Double Time - C→, C→, A, A, C↓, C↓
Inverted Song of Time - C↓, A, C→, C↓, A, C→
Song of Healing - C←, C→, C↓, C←, C→, C↓
Epona's Song - C↑, C←, C→, C↑, C←, C→
Song of Soaring - C↓, C←, C→, C↓, C←, C→
Song of Storms - A, C↓, C↑, A, C↓, C↑
Sonata of Awakening - C↑, C←, C↑, C←, A, C↓, A
Goron Lullaby - A, C→, C←, A, C→, C←, C→, A
New Wave Bossa Nova - C←, C↑, C←, C→, C↓, C←, C→
Elegy of Emptiness - C→, C←, C→, C↓, C→, C↑, C←
Oath to Order - C→, C↓, A, C↓, C→, C↑