Majora's Mask(The Masks) screenshots and uses. Possible spolier

[Hydra]

The Deku Mask:
Allows you to transform into Deku Shrub and use ablilitys.

[Hydra]

The Goron Mask:
Allows you to transform into Goron and use abililys.

[Hydra]

The Zora Mask:
Allows you to transform into Zora and use abilitys.

[Hydra]

The PostMan's hat:
You can open mail boxs and take peoples stuff. Kinda like real mail

[Hydra]

The all night mask:
You can't fall asleep unless you listen to Anju's Grandmother's stories.

[Hydra]

The Blast Mask:
Makes your head explode(will take damage)

[Hydra]

The Stone Mask:
Makes you invisible to enemys appart from mini bosses and bosses.

[Hydra]

The Great Fairy Mask:
The hair shimmers when there is a fairy nearby.

[Hydra]

The Keaton Mask:
Summons the Legendary keaton at certain places.

[Hydra]

The Bremen Mask:
Makes dog and chickens follow you.

[Hydra]

The Bunny Hood:
You can run faster and jump thurther, also you can see the timer in the postman timing game.

[Hydra]

Don Gero's Mask:
Allows you to talk to frogs.

[Hydra]

The Mask of Scents:
Allows you to see what you smell.

[Hydra]

Romani's Mask:
Lets you enter the Milk Bar Latte from 10pm to 6am.

[Hydra]

Circus Leader's Mask:
The Groman Bros won't attack while defending Cremia's Milk Wagon.

[Hydra]

Kafei's Mask:
Wear this and talk to Anju to start the Anju/Kafei side quest.

[Hydra]

The Couple's Mask:
Wear this and talk to the Mayor to get a heart piece.

[Hydra]

The Mask of Truth:
Allows you to talk to gossip stones.

[Hydra]

Kamaro's Mask:
Dance in front of the Rosa Sisters to get heart piece.

[Hydra]

Gibdo Mask:
Gibdos and ReDeads wount attack you but will do a dance.