Mini-dungeon

A mini-dungeon does not constitute a whole dungeon, but contains enough elements of a dungeon. Grottos are not considered mini-dungeons. Mini-dungeons usually must be completed as part of the storyline. Final dungeons do not count as mini-dungeons because the final boss is normally faced there. Hidden dungeons do not count as mini-dungeons because they are not necessary to complete the game.

A Link to the Past
Hyrule Castle has an item (the Boomerang) and a heart container, but the "boss" is a normal enemy and does not have the boss music. It is located in the centre of the map.

Hyrule Castle Tower has no item and no heart container, but it has a boss, Agahnim. It is directly on top of Hyrule Castle.

Link's Awakening
Kanalet Castle has no item and no heart container, but defeating its boss gets you five golden leaves, which when given to Richard get you the Slime Key. It is located to the north of Martha's Bay.

Ocarina of Time
The Ice Cavern has an item (the Iron Boots) that is taken from the boss, the White Wolfos. The Serenade of Water is also learned here. It is located in the Zora's Fountain, but is only accessible in the future, when Zora's Domain has frozen.

The Kakariko Well has an item (the Lens of Truth), but no boss or heart container. It is located in the heart of Kakariko Village.

The Gerudo's Training Ground is found in the Gerudo Valley.

Oracle of Ages
The Moblin's Keep has no item and no heart container, but it has a boss, the Great Moblin. It is the home of the Great Moblin, and is located on Rolling Ridge in the present.

Ambi's Castle has no item or heart container, but it has a boss, Possessed Nayru. It is located to the north of Lynna Village in the past.

The Wind Waker
The Forsaken Fortress has an item (the Skull Hammer), a heart container, and a boss, the Helmaroc King. However, it is done in two part, and the first part is done without the item. It is located at extreme north-west of the Great Sea.

The Minish Cap
The Royal Crypt has no item, heart container, or boss. However, it is filled with traps and enemies, and it is necessary to complete the it. It is located in the Royal Valley.

Twilight Princess
The Cave of Ordeals has no item, heart container, or boss. It has fifty floors, each with several enemies that get harder as you go down. Every ten floors the Great Fairy appears. The prize at the end is Fairies' Tears, a cure-all substance. The Tears can then be found at any of the fairy springs around Hyrule. It is located in the Gerudo Desert.