Forest Temple (Ocarina of Time)

The Forest Temple is the first dungeon as Adult Link in Ocarina of Time. The main item obtained is the Fairy Bow, and the temple's boss is Phantom Ganon.

Entrance to the Temple
Deep within the Sacred Forest Meadow in the Lost Woods lies the Forest Temple, inhabited by many fierce foes. Since the stairway leading to the temple is now broken, the only way to gain access to the temple is by obtaining the Hookshot from the Kakariko Graveyard and grabbing onto a tree branch hanging off the top of the entrance platform.

Themes and Navigation
The Forest Temple is an eerie, complex temple filled with strange puzzles and other features designed to confuse its explorers, such as an array of switches which invert hallways when pressed. Most of its rooms and corridors are covered with moss and vines, and many hold enemies like the Skulltula and Deku Baba. The dungeon's interior design is reminiscent of a mansion or castle, with portraits hanging in certain rooms and quaint red carpets decorating the floor. The temple is home to the four Poe Sisters that lurk deep inside and guard the way to its master; Link must hunt down and destroy them to complete the temple. The first two sisters can be found on the upper levels of the temple, in passageways with staircases; the third sister appears in the eastern end of the upper levels after Link solves a jigsaw puzzle, and the final sister returns to the dungeon's main chamber after the other three are defeated. The Fairy Bow is the Temple's item, and is found on the northern end of the upper level of the temple. The dungeon also features two wells that are connected to each other. It is also one of the few dungeons in the Zelda series whose structure can be altered—in this case, by twisting and untwisting hallways, revealing new paths (For another example, the Stone Tower Temple).

The temple's music will also become a monster of its very own with its eerie but gorgeous tune and unnatural sounds. It's also the first temple where Link meets the dreaded Wallmaster in Ocarina of Time, and its boss is the fierce Phantom Ganon. Link journeys here to save his childhood Kokiri friend Saria only to awaken her as the Sage of Forest. Her power helps Link continue on his journey to free the other imprisoned sages.

Master Quest
Mostly, the locations of keys and locked doors have been changed. The two Wolfos are no longer at the entrance of the Temple, but at the room where the first Stalfos was fought, who appears instead in a small connecting room and rewards Link with the map. There are two extra blocks in the room with the block puzzle, but they serve no purpose other than causing confusion. The first twisted room is straight when it is first found, and is twisted by activating a switch, not with arrows. Several puzzles requiring Time Blocks are found, too. There are more Skulltulas and Skullwalltulas in the dungeon. In the room where the Floormaster was originally found (which is now found in another room) is a single ReDead. The well is now emptied by shooting an eye with the bow.

Trivia

 * It is believed this dungeon was originally meant to be the Wind Temple, but was changed to a forest-themed dungeon later in the development of Ocarina of Time. This belief is supported by the appearance of the Forest Medallion, which has an image somewhat similar to a wind-like vortex, and the Forest Barrier of Ganon's Tower, which is actually wind-themed. It is worth noting that the forest and wind elements are often associated with one another in The Legend of Zelda.
 * It is strongly believed by Team Beta Triforce that the Forest Temple and Ganon's Castle were Hyrule Castle at a very early point in development, due to how the temple resembles a castle from A Link to the Past.
 * The Forest Temple has been remarked by the fans, along with the Stone Tower Temple in Majora's Mask, to be one of the most unorthodox dungeons in the Zelda series.
 * The music of the Forest Temple has a strings portion that is replicated in the City In The Sky in Twilight Princess.