Moon Dungeon

The Moon Dungeons are a series of mini-dungeons found inside the Moon, connected by the Grassy Playfield. It is the location of the final battle between Link and Majora's Mask.

Themes and Navigation
The Moon Dungeons become accessible once Link and Tatl successfully summon the Four Giants to halt the descent of the Moon. Afterwards, Majora's Mask will discard the Skull Kid's unconscious body and enter the Moon's mouth, once more driving it down to Termina. To stop this, Link and Tatl follow the cursed Mask and transport to a serene, hilled landscape known as the Grassy Playfield.

Near a Tree atop a hill in the Grassy Playfield are four Moon Children playing. Each Moon Child bears the remains of bosses that were plaguing each Giant. When spoken to, they ask Link to play with them in exchange for Masks. If Link complies, he will be teleported to one of the Moon Dungeons, depending on which Moon Child was spoken to.

The individual Moon Dungeons are entirely optional, as Link must only speak to the Moon Child that sits beneath the Tree wearing Majora's Mask. If Link has not completed all of the Moon Dungeons, the Moon Child will ask Link to play with him before telling him that his Masks are weak. However, if Link has given away each of his Masks, the Moon Child will notice and offer to play "good guys against bad guys", giving Link the Fierce Deity's Mask before initiating the final battle.

Deku Dungeon
The Deku Dungeon is a simple trial that requires Deku Link to skip across spinning platforms containing Deku Flowers while also avoiding spinning, spiked bars. Link can only enter it through giving the Moon Child wearing Odolwa's Remains one Mask. On each side of the Deku Dungeon are Gossip Stones, which speak of the Garo's Mask, Romani's Mask, the Troupe Leader's Mask, the Postman's Hat and the Couple's Mask. On one of the ledges on the right-hand side is a Piece of Heart. The Moon Child at the end asks for one more Mask and in return asks Link whether the people he considers to be friends reciprocate the sentiment.

Goron Dungeon
The Goron Dungeon is a trial that requires Goron Link to race across thin strips of land, only being directed by bouncing off of open Treasure Chests. Link can only enter it through giving the Moon Child wearing Goht's Remains two Masks. Scattered across the Goron Dungeon are Gossip Stones that speak of Kamaro's Mask, the Captain's Hat, the Gibdo Mask, Don Gero's Mask and the Great Fairy's Mask. The Moon Child at the end asks for two more Masks and in return questions Link whether the things that make him happy also make others happy.

Zora Dungeon
The Zora Dungeon is a watery maze that requires Zora Link to swim through interconnected tubes to reach a destination. Link can only enter it through giving the Moon Child wearing Gyorg's Remains three Masks. The path to the Moon Child is left, left, right, right. Similarly, the path to the Piece of Heart is left, left, right, left. In the Nintendo 3DS version, the path to the Moon Child is left, right, top and the path to the Piece of Heart is left, right, middle All other paths lead to air pockets with Gossip Stones.

The Gossip Stones in the Zora Dungeon speak of the Stone Mask, the Bremen Mask, the Blast Mask, the Giant's Mask and the Mask of Scents. The Moon Child at the end asks for three more Masks and in return posits whether doing the right thing makes everyone happy.

Link Dungeon
The Link Dungeon is a linear set of rooms that require skills usable only by Link's Hylian form. Link can only enter it through giving the Moon Child wearing Twinmold's Remains four Masks. Inside, Link must fight a Dinolfos, a Garo Master and an Iron Knuckle to progress through each room. The room containing the Iron Knuckle yields a Treasure Chest upon defeat, which is necessary to destroy the cracked wall hiding an Eye Switch, which summons a ladder when hit. The subsequent room also contains a cracked ceiling, which hides a frozen Eye Switch, requiring Link to hit it with a Fire Arrow in order to release the portcullis protecting the door to the exit, where the Moon Child asks for four more Masks. This Moon Child asks Link what his true face is.

Trivia

 * In Majora's Mask 3D, each of the dungeons has a brief intro cutscene in which the camera briefly shows off the area. In Majora's Mask, these cutscenes (except the cutscene for Link's dungeon) exist in the game's data, but are unused.
 * The final two chambers of the Link Dungeon require a cracked wall and ceiling to be destroyed using Bombchus, and then shooting the revealed eye switches. If Link's supply of Bombchus is depleted, it is still possible to bypass the rooms by playing the Song of Storms to the Gossip Stone in the preceding chamber. Upon entering the next chamber, the ladder will appear, or the portcullis will be raised, despite the eye switches not having been triggered.