Keyhole

You may be looking for the manga chapter.

A Keyhole is a gateway in each world that leads to the heart of that world. The Heartless invade worlds and search for their Keyholes. Upon discovering the Keyhole, the Heartless will enter it and eventually devour the world's heart. After a world's heart is consumed, the world crumbles, and fades from existence. It is said that, if the Keyblade locks a world's Keyhole, it can never be opened again.

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World Keyhole Locations

Kingdom Hearts Birth by Sleep

• Land of Departure: The Keyhole is in the Throne Room, behind the middle throne.

File:Keyholes KH.png

All the Keyholes of Kingdom Hearts in chronological order.

Kingdom Hearts

• Destiny Islands: The Keyhole takes the form of a wooden door with no knob in the Secret Place. It was opened by Riku.
• Wonderland: The Keyhole is appropriately hidden inside the mouth of the Doorknob.
• Deep Jungle: The Keyhole is hidden at the top of the waterfall rock face in the Cavern of Hearts, behind a flock of butterflies. The pathway into the waterfall rock is shown when Kerchak reveals it to them.
• Traverse Town: Traverse Town's Keyhole is located in the water fountain in the Second District. It only opens up when someone pulls the rope on the district's bell thrice, causing the water fountain to change face.
• Agrabah: The Keyhole is in the final room of the Cave of Wonders, i.e. the Lamp Chamber. After stealing the lamp from Aladdin, Jafar's first wish was revealing it.
• Atlantica: The Keyhole is hidden in Ariel's Grotto. It can only be accessed using a Crystal Trident or King Triton's trident. After defeating Ursula, Triton allowed Sora to lock the Keyhole using the trident to reveal it.
• Halloween Town: The Keyhole was hidden under Oogie's Manor. After it collapsed, the moon reflected on the spot where the Keyhole was.
• Neverland: Neverland's Keyhole is located on the clock face of Big Ben. It only reveals itself once the minute hand moves up to the strike of twelve.
• Olympus Coliseum: The Keyhole was hidden under a stone block in the Lobby. It can only be accessed once Sora, Donald and Goofy use the yellow Trinity Mark to remove the stone block.
• 100 Acre Wood: The Keyhole is on the clasp that closes the book.
• Hollow Bastion: The Keyhole of this world, also known as the Final Keyhole, has some controversies around it. In the Ansem Reports, Xehanort states that he found a strange door in the basement of the castle. The door had a large keyhole on it and it wasn't locked, so he opened it, seeing on the other side what appeared to be the world's heart. However, Maleficent was gathering the princesses to open the "Final Keyhole" on the top of the castle, where the in-game Keyhole was located. So it appears that the Keyhole found by Xehanort in the basement was the actual Keyhole to that world's heart, while the Keyhole Maleficent was working so hard to create was an artificial Keyhole to be used as a pathway to Kingdom Hearts. This could probably explain why Hollow Bastion wasn't destroyed along with the rest of that world.

Kingdom Hearts: Chain of Memories

• Castle Oblivion: The Keyhole is located on the door in the Unknown Room before Sora fights his final battle against Marluxia.

Kingdom Hearts coded

• Destiny Islands: The data Keyhole is behind the waterfall.
• Traverse Town: Traverse Town's data Keyhole is in 4 pieces held by Huey, Dewey, and Louie and Data Riku.
• Wonderland: The data Keyhole is inside a cage.
• Olympus Coliseum: The data Keyhole is in the entrance to the coliseum.
• Agrabah: The data Keyhole is inside one of the bug blox.

Kingdom Hearts 3D: Dream Drop Distance

One of the Keyholes in Traverse Town.

• La Cité des Cloches: On Sora's side, the Keyhole of Sleep is located inside the cathedral, in one of roof leveled windows. For Riku, it's in the central window of the cathedral at the Square.
• The Grid: The Keyhole is located in the arena where Sora fights Rinzler and frees him from CLU's brainwashing. On Riku's side, it's at The Portal to leave The Grid.
• Prankster's Paradise: For Sora, the Keyhole is located on a beach, after the battle with Chill Clawbster. For Riku's it's in Monstro's mouth, where Geppetto's boat is.
• Country of the Musketeers: On Sora's side, the Keyhole is located in the courtyard. As for Riku, it's in the backstage of the Opera house, after the battle with the Holey Moley.
• Symphony of Sorcery: The Keyhole for both of Sora and Riku is located in the Sorcerer's Loft in Yen Sid's room.
• Traverse Town: The Keyhole is located in the Fifth District, after Joshua explains Young Xehanort is responsible for splitting the world into two different versions. A second Keyhole is located in the Third District after Spellican is sent fleeing to Sympohony of Sorcery.
• Destiny Islands: The Keyhole is located beneath the ocean, following the battle with Ursula. However, this is not one of the Keyholes of Sleep; it merely served as an entrance to the Sleeping Worlds and in Riku's case to Sora's dreams.
• Dive to the Heart: The Keyhole is located on the platform after freeing Sora from Armored Ventus Nightmare, leading to the data Ansem the Wise placed in Sora. Another Keyhole is located within this data.