Universe of Kingdom Hearts
The Kingdom Hearts video game series, developed by Square Enix in collaboration with Disney, is set in a universe consisting of numerous self-contained worlds based on intellectual properties from both companies. Most worlds are based on different Disney films, although several original worlds also appear. The series centers on the character Sora, a boy who searches for his lost friends and encounters Disney and Square Enix characters as he travels between worlds. In the first game, Kingdom Hearts, he fights against the villainous Heartless and seals each world he visits to prevent their return. In Kingdom Hearts II, he helps the residents of these worlds again while searching for his friend Riku. The Kingdom Hearts games have been both critically acclaimed and commercially successful, and the design of the worlds have been praised for their faithfulness to the source material. Concept and design Nomura intended hearts and the strengths and connections of the heart to be a common theme in the games. Characters within the Kingdom Hearts series are composed of three parts: body, soul, and heart. The body acts as a vessel for the heart and soul, with the soul giving life to the body. The heart holds their memories and gives them emotion, light, and darkness. The Kingdom Hearts games are divided into various game levels, referred to as "worlds", which the player progresses through. Worlds vary in appearance, typically dependent on the Disney setting which they are based on. The worlds' graphics resemble the art style from the originating Disney film, and the worlds are inhabited by characters from their respective films; for example, Hercules and Philoctetes appear in Olympus Coliseum from Hercules, while Aladdin, Princess Jasmine, and the Genie appear in Agrabah from Aladdin. The game worlds consist of interconnected field maps where battles and plot-related events occur. Players travel between worlds in different ways each game, such as the "Gummi Ship" in the original Kingdom Hearts, "Keyblade glider" in Kingdom Hearts Birth by Sleep, "Corridors of Darkness" in 358/2 Days, and "Sleeping Keyholes" in Dream Drop Distance. Worlds created specifically for the series mirror the overall appearance of other worlds and predominantly feature characters from Square Enix games and original characters. Though Disney gave director Tetsuya Nomura freedom to choose which characters and worlds would be used in the games, he and his staff tried to stay within the established roles of characters and boundaries of the worlds. Nomura found managing and keeping consistent multiple worlds to be problematic. After determining the number of worlds in the universe, Nomura picked ones he felt would fit into the series' scenario, which were then evaluated by his team and Disney representatives. He tried to maintain the same number of worlds in each game and tried to minimize any overlap in the overall look and feel of each world, which he and his staff did by categorizing Disney worlds by appearance and setting. For example, a world based on The Jungle Book was considered for the first game,