Universe of Kingdom Hearts
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In the Universe of Kingdom Hearts, also called the World, there are many worlds that fall into certain realms. All of these realms are on their own plane of existence.
History
According to the story told by Kairi's Grandma in the Hollow Bastion's Library, long ago, there was one single world that was constantly bathed in the warmth of Light. When people began to fight over the Light within their world, Darkness appeared in their hearts, and the world was consumed. However, fragments of light remained within the hearts of children. From this light, children were able to rebuild the lost world. However, darkness still existed, which caused the worlds to be separate from each other, divided, waiting for the true light to return. This was explained in more detail in Kingdom Hearts Birth by Sleep, where it was revealed the fight was between the many Keyblade holders over Kingdom Hearts, and eventually led to the Keyblade War.
Prior to Kingdom Hearts, the worlds were surrounded by barriers, to prevent outside interference, making it impossible for different worlds to have contact. The arrival of the Heartless caused the barriers between the worlds to crumble and disappear, and some worlds were even consumed by the Heartless. Gummi Blocks are actually pieces of these broken barriers.
Those who travel between worlds are advised to avoid meddling in the affairs of other worlds, and informing their inhabitants of the existence of other worlds, in order to maintain a balance of separation. To this end, several characters, notably Sora, Donald, and Goofy, magically alter their physical appearances in certain worlds to avoid standing out. For example, they become sea creatures in Atlantica, Halloween monsters in Halloween Town, jungle animals in Pride Lands, and computer A.I.s in Space Paranoids.
Travel
Travel between the worlds is normally impossible. The worlds are all protected by dimensional barriers that prevent outsiders from entering for the most part. However, these barriers can be broken, resulting in a meteor shower in that world.
In Kingdom Hearts and Kingdom Hearts II, Sora, Donald, and Goofy use the Gummi Ship to travel between worlds on the World Map, an event that serves as a mini-game between areas. Some worlds require certain special Gummi Blocks to access; for example, a special Navigation Gummi must be installed by Cid to unlock a second set of worlds in Kingdom Hearts. Once they reach them, the party can enter and then depart each world through its Save Points.
Three worlds can only be accessed by entering through other worlds and do not directly require use of a Gummi Ship:
- 100 Acre Wood via Pooh's book in Traverse Town (Kingdom Hearts) and Hollow Bastion/Radiant Garden (Kingdom Hearts II).
- Timeless River via the Hall of the Cornerstone at Disney Castle.
- Space Paranoids via Ansem's computer in Hollow Bastion/Radiant Garden.
It should be noted that in Kingdom Hearts: Chain of Memories, there are no Gummi Ships; the worlds Sora visits are recreations from his memories from the first game brought to life on each floor of Castle Oblivion.
Ways to travel
Currently, there are five known ways to travel between the worlds:
- Gummi: Pieces of Gummi known as "Star Shards", or the Gummi Ships built from them are able to travel along the lanes. Using Gummi Ships is much easier, as single Star Shards will cause random jumps if their handler isn't skilled in their use.
- Corridor of Darkness: By tunneling directly through the darkness, a traveler can move between worlds almost instantaneously. However, their direct contact with the darkness between worlds puts them at a great risk of being corrupted or engulfed by the darkness.
- Keyblade Glider and Keyblade Armor: Keyblade adepts can transform their Keyblade into a vehicle that can traverse the lanes. Like a Corridor of Darkness, this method puts them in direct contact with the darkness, but their Keyblade Armor protects them from its effects.
- Teleportation: Certain sorcerers, like Merlin and Maleficent, are able to instantaneously transport themselves and others directly from world to world, apparently without passing through the lanes at all.
- Time travel: Certain sorcerers, like Merlin and Yen Sid, are able to open passages to past versions of a world, or even the "Worlds Submerged in Sleep", allowing travelers to move not only through space but also time.
Lanes Between
According to Kingdom Hearts Birth by Sleep, the pathways between the worlds are known as the Lanes Between. The Lanes Between are a series of "roads" between the worlds. Ventus, Aqua, and Terra frequently use these paths to navigate the worlds. The presence of Darkness is very strong within them, forcing travelers to wear their Keyblade Armor as a safety precaution. Sora, Donald and Goofy, on the other hand, are inside a Gummi Ship which shields them from darkness while traveling.
Stars
Stars are massive, luminous balls of plasma that are held together by their own gravity.
In the Kingdom Hearts games, each star is the fragment of one specific world. Should a star stop shining, that would mean that particular world has disappeared from existence, most likely from destruction from the Heartless.
In Kingdom Hearts, many stars disappeared. In Mickey's letter to Donald (before Destiny Islands is attacked by the Heartless), Mickey mentions the fact that the stars have been disappearing, one by one, and so he went to find out why. When Donald and Goofy first arrived at Traverse Town, they discovered a star corresponding Destiny Islands fade out of existence. Some of them were restored after Sora and his friends stopped Ansem's plan to plunge the world into darkness, but others remained submerged in sleep.
In Kingdom Hearts II, Mufasa implies that there are stars to represent certain individuals as well, such as when he told young Simba that all the great kings of the Pride Lands are looking at them in the form of stars. Years later, Simba tries to reach out to his deceased father, and he appears to him immediately. The same implication happens in Kingdom Hearts Birth by Sleep, when Master Yen Sid detects that "Eraqus's star has blinked out," after he was struck down by Master Xehanort.
Realms
Realm of Light
The Realm of Light (光の世界 Hikari no Sekai) is a realm made up mostly of light and makes up almost half of the Kingdom Hearts universe, similar to the Realm of Darkness. Like the Realm of Darkness, the Realm of Light has a Keyblade, the Kingdom Key, which chose Sora as its wielder. Most of the game's worlds are found here, save for those in the Realm of In Between, like Twilight Town, Castle Oblivion, and The World That Never Was. It can be presumed that most of the Worlds accessible by the Gummi Ship are either within the Realm of Light, or are related to it, like Twilight Town.
In Kingdom Hearts II, one notable citation had been made by Sora regarding the Realm of Light during the scene of Sora and Riku at the "end of the road" after defeating Xemnas: The other side... The realm of light is safe now. Kairi, the King and the others are there.
Door to Light
The door leading to the Realm of Light is called the Door to Light. It was the door Sora and Riku went through while they were stuck in the Realm of Darkness. It is not certain what caused the door to appear, though one reason could be, as Riku pointed out at the end of the game, the light within Sora's heart, which was brought out by Kairi's Letter.
Realm of Darkness
The Realm of Darkness is a realm made up of Darkness in people in every world. As with the Realm of Light, this realm has a Keyblade, Kingdom Key D, which chose King Mickey as its wielder. Kingdom Hearts is found here. This is where the most powerful Heartless can be found, as this is also the home of all the Heartless. Sora fought Ansem, Seeker of Darkness here in Kingdom Hearts.
Door to Darkness
The Door to Darkness is the dark counterpart of the Door to Light. It was shown to lie within the End of the World in Kingdom Hearts. Beyond the door is the Realm of Darkness where Kingdom Hearts, the heart of all worlds, resides.
Realm Between
The Realm Between is the third realm in the Kingdom Hearts series, and lies on the boundary between the Realms of Light and Darkness. Few worlds exist within it, and most have some special nature or purpose.
As of now, Traverse Town, Land of Departure/Castle Oblivion, Twilight Town, Mysterious Tower, and The World That Never Was are the only worlds confirmed to exist within the Realm Between. Each world ties closer to the Realm of Light or the Realm of Darkness, with the exception of Twilight Town, which exists exactly in the middle.
Sleeping Worlds
Worlds
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A World (世界 Sekai) is a location that appears in the Kingdom Hearts series. Serving as the "levels" for the games, Sora and other characters are charged with visiting and protecting them through the course of the series. By defending the worlds from the Heartless, Nobodies, or other enemies, Sora keeps the Darkness from spreading and the worlds from being manipulated or destroyed. At the end of every world Sora, Donald, and Goofy have to fight a boss of that world (which is either a giant Heartless or a Disney villain) which opens the Keyhole area when defeated. At the end Sora locks the Keyhole and earns a Gummi that will let him go to the next world.
Each world that appears in the Kingdom Hearts series has its own distinct look, and for the most part hold true to the movies and cartoons they are based on. Often the plot of the game in that world will be based on its original source. Almost all worlds can be visited in the course of the game and are part of the playthrough; there are exceptions, though, since some places can be seen in cinematics but not actually accessed by Sora's party. All worlds are separate from one another, and with a few exceptions, most people are unaware of the existence of other worlds.
World characteristics
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There are over thirty worlds that have appeared in the Kingdom Hearts series so far. Most of them are based on Disney's animated features and contain locations and characters from or inspired by the films. As a result, worlds are greatly varied in appearance, style, and nature, as their sources range from the oldest cartoons created by Disney to more current movies in the Disney canon. The oldest source is the 1928 cartoon "Steamboat Willie", used as a basis for Timeless River, while the most recent inspiration for a world from Disney's animated features is 2002's Lilo & Stitch, the source for Deep Space. In Kingdom Hearts II, two live-action films, Pirates of the Caribbean: The Curse of the Black Pearl and Tron served as the foundation for the worlds Port Royal and Space Paranoids, respectively.
In addition to the Disney-based worlds, twelve worlds are exclusives that were created by game developers Square-Enix just for the Kingdom Hearts series. They are not part of the Disney film canon, nor Square-Enix's games canon, but do tend to be populated with Square-Enix characters, especially from the Final Fantasy series, as well as the occasional Disney character or original characters created just for Kingdom Hearts.
Some worlds have names that don't seem to accurately reflect what is found there. A famous example is Neverland in Kingdom Hearts; Sora and company get to go through Captain Hook's ship and fly around the Clock Tower, but never actually reach the island Neverland where Peter Pan and Tinker Bell live. To further confuse things, some worlds in Kingdom Hearts II contain what could almost be considered sublevels or second worlds within them, such as the Underworld at Olympus Coliseum or Christmas Town in Halloween Town.
List of worlds
Kingdom Hearts Birth by Sleep
- Realm of Darkness Profil.png
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Kingdom Hearts
Kingdom Hearts: Chain of Memories
Kingdom Hearts 358/2 Days
Kingdom Hearts II
Kingdom Hearts coded
Kingdom Hearts 3D: Dream Drop Distance
World party members
Kingdom Hearts Birth by Sleep
Kingdom Hearts Birth by Sleep does not feature set party members and allows only one character for most of the game, granting party members only in a handful of battles. Instead of party members, the game focuses on the Dimension Link system, a successor to the Summon system.
Terra
In the Land of Departure, Radiant Garden, and Mirage Arena (For Ventus & Aqua)
Ventus
In the Land of Departure, Radiant Garden, and Mirage Arena (For Terra & Aqua)
Aqua
In the Land of Departure, Radiant Garden, and Mirage Arena (For Terra & Ventus)- Prince Philip KHBBS.png
Prince Phillip
In Enchanted Dominion (For Aqua) - King Mickey KHBBS.png
King Mickey
In Keyblade Graveyard & Radiant Garden (For Ventus & Aqua) 
Experiment 626
In Deep Space (For Ventus & Aqua)
Zack
In Olympus Coliseum (For Ventus)
Hercules
In Olympus Coliseum (For Ventus & Aqua)
Kingdom Hearts
In certain worlds, a character from that area will be available to fight, and can replace Donald or Goofy in the party. Kingdom Hearts had six such worlds with party members.
Kingdom Hearts: Chain of Memories
In Castle Oblivion, Sora and Riku's party members can only act in battle by appearing as friend cards; this goes for not only the world-specific allies who are derived from Sora's memories, but also for Donald, Goofy, Pluto, and Mickey. Sora has been given cards in Castle Oblivion and is sent to worlds from his own memories and his past party members from Kingdom Hearts from the Disney worlds he had visited have become memory cards.
Kingdom Hearts 358/2 Days
Kingdom Hearts 358/2 Days has several worlds that Saïx sends Roxas to on missions, often along with other members of the Organization.
Kingdom Hearts II
Kingdom Hearts II increased the number of worlds with party characters to nine, including one in almost every Disney-based world. Three characters from Kingdom Hearts returned for battle: Aladdin, Jack Skellington, and Beast, although Beast was moved from Hollow Bastion to his own world. Ariel reappeared in Atlantica, but no longer as a party character, Peter Pan became a Summon, and Simba, formerly a Summon, became a party member in his home world of the Pride Lands. The game added a party member, Jack Sparrow, with the same first name as another, Jack Skellington; Sora differentiates between the two by referring to Jack Sparrow as Captain. To make the world-based party members more powerful, special attacks were developed for each character that Sora could call on in the heat of battle. Kingdom Hearts II also included the first Final Fantasy party character, Auron, and allowed Sora to fight alongside his best friend, Riku.
Kingdom Hearts coded
The worlds in Kingdom Hearts coded are drawn from those in Kingdom Hearts, though the party members and layout are different.
- Donald KHII.png
Kingdom Hearts 3D: Dream Drop Distance
Kingdom Hearts 3D: Dream Drop Distance does not feature world party members, as they are replaced by Dream Eater Spirits as your party members, though Riku does help Sora in the battle against Ursula in the prologue of the game.
