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Attachment Before the game was released in the U.S., Square held a "Name-in-Game" contest. A person named Kurt Zisa won the contest, and his name was used for a hidden boss in the game.
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Attachment In the Secret Place, on Destiny Islands, the walls are covered in paintings which seem to foreshadow some of the earlier events in the game. For instance, there is a painting of Sora winning at the coliseum; the tree house from Deep Jungle; and Pluto waking Sora up in Traverse Town.
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Sora was not originally the main protagonist of the series. In the beginning, Disney had desired Donald Duck to be the protagonist, while Squaresoft wanted Mickey Mouse. Series creator Tetsuya Nomura wanted neither and developed an original character based off of Disney's style. In the end, Sora was created. His yellow shoes, red shorts and white gloves are based on Mickey Mouse.
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Attachment According to some concept art released by Square Enix, Sora was originally not going to wield a Keyblade at all, but a chainsaw sword instead. He was also going to have a design with lions fur, claws, a tail and ears.
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Bahamut, a recurring summoned creature from the Final Fantasy series, was planned to be a summon for Sora. But it was removed from the final version. Searching through the game data, a Bahamut summon option can be chosen through the use of cheat codes. However, since there is nothing to execute when it is chosen, the game will crash.
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The secret ending, "Another side, Another story," was not meant to be a real game. It was only there to show off ideas that Tetsuya Nomura had for the sequels. It was not until Kingdom Hearts 358/2 Days that the fight shown was playable.
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Attachment Disney Castle was supposed to be playable. It was shown in a beta trailer but the level was cut from the final version. However, through cheat codes, it can be accessed.
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Attachment Rikku was going to have a major role in the first game. She was going to be a part of Leon's group in Traverse Town and help Sora throughout the game. She was removed because of the similarly-named character Riku, and was replaced with Yuffie. She later appeared with the rest of the Gullwings in Kingdom Hearts II.
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In the Japanese version of Kingdom Hearts, the Chernabog fight does not have the "Night on Bald Mountain" music. Instead the regular boss music will play. The "Night on Bald Mountain" music was added to the international release to make the scene more true to the scene from Fantasia. The music was added into the Final Mix version of the game.
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If you enter the Hercules Cup time trial, get to Hercules, pause the game and choose to restart the time trial, it will take you back to the start of the Hercules fight and the timer will be frozen at 00'06"23.
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Attachment There was a planned boss battle with Riku who would be possessed by Ansem in an area titled Crumbling Island at the End of The World which was based off of Destiny Island, but devoured by the darkness.
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Attachment In Deep Jungle, outside of the tents on a table is a pot and cup which bare a resemblance to Ms. Potts and Chip from Beauty and the Beast. These characters also appeared in the Tarzan film.
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Completing the world "Deep Jungle" before Wonderland will cause Snow White to be kidnapped instead of Alice in the cut scene which is shown after completing Deep Jungle.
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Attachment The enemy "Assault Rider" was meant to appear in the game but its style didn't fit any of the worlds so it was removed and used in Kingdom Hearts 2 instead.
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Attachment The ending to the beta trailer for the game shown at E3 2001 featured an alternate logo. The word "Kingdom" is shown in normal golden text while the word "Hearts" is displayed in a modified version of the final logo's spiky text. The trademark heart is also missing from this version of the logo.
person SiiGMA Viperz calendar_month May 8, 2013
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Whenever Sora wins a round in the Olympus Colosseum, he performs a small victory pose. These animations are based off of Cloud's victory poses in Final Fantasy 7, and Squall's from Final Fantasy 8.
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The original data and assets for Kingdom Hearts have been lost forever. This is the reason Kingdom Hearts HD 1.5 Remix is being made from the ground up.

"Kingdom Hearts was created a long, long time ago... ...The original data was missing already. It was lost so we had to research, to dig out the original game and recreate everything for HD. It was not that easy." - Tetsuya Nomura
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Attachment An early trailer reveals that Donald and Goofy's costumes were originally different.
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The idea for the game came from an elevator ride with Shinji Hashimoto (Final Fantasy and Square producer) and a Disney producer, who shared the same building in Tokyo. They came up with a crossover as a vague production idea, and the head of Square-Enix, Hironobu Sakaguchi, later agreed to the idea.
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In an early trailer for the game, there is a scene showing Riku on top of Big Ben in Neverland. This scene does not appear in the final game, nor does Riku ever go to Big Ben in any way. Despite this, it is considered canon as a cutscene in Kingdom Hearts Re:coded shows that this is where Riku and Kairi went after leaving Captain Hook's ship.
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