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. The list was then evaluated by his team and finally by Disney representatives. Nomura tried to maintain the same number of worlds in each game and made an effort to minimize any overlap in the overall look and feel of each world. He and his staff accomplished this by categorizing various Disney worlds by appearance and setting. For example, a world based on "The Jungle Book" was considered for the first game, but was omitted due to its similarity to Deep Jungle from "Tarzan". They also tried to take into account worlds with Disney characters that would be interesting. For example, Nomura chose to include a "Mulan" world for its unique atmosphere. The "Tron" world's design was meant to emulate an old computer game in the style of the 1982 film. Nomura got the idea to include this world after seeing a Disney employee working on "Tron 2.0". He hoped that the fact that it was so different from the other worlds would make it enjoyable to players.