The anti-establishment themes of the 1999 film Fight Club were another influence. Smilebit used thicker lines for stand-out objects. Smilebit developed a new cel-shading technique not used at the time as it would not have been possible on the Dreamcast or PlayStation 2. The game features graffiti by a variety of artists, including Eric Haze, who had designed album art for acts including the Beastie Boys and Public Enemy. Smilebit initially planned to make a skateboarding game, but this was changed due to the legs having to be fixed. Jet Set Radio was one of the earliest games to feature an open 3D world, which presented the team's biggest challenge. Kikuchi said: "Making an entire town in a game was quite the prospect. It's not hard with modern hi-spec hardware, but that wasn't the case back then... It was very difficult from a programming standpoint." Another Sega game developed in that period, Shenmue (1999), also featured an open world, but Kikuchi said the games posed different technical challenges, as Shenmue does not allow the player to jump or move at speed. The team implemented grinding to allow players to enjoy speed without worrying about colliding with obstacles. Smilebit chose to have a fixed camera as an attempt to reduce motion sickness. They attempted to make the game impossible to duplicate on PlayStation 2 by pushing the Dreamcast limitations using bright colors, realistic shadows, and more than sixteen NPCs on-screen without lag that would have been impossible on PS2 due to its smaller memory. The settings were inspired by Japanese locations such as the Tokyo shopping districts of Shibuya and Shinjuku, which Smilebit photographed to use as references. Sega feared that the game's style might alienate players outside Japan and requested changes for the international versions. The team added stages modeled after New York City: one based on Times Square, and another on Roosevelt Avenue along Queens and Brooklyn, and changed the nationality of two characters to American. The interactive credits sequence of the Japanese version was also cut, as localizing it would have meant rebuilding the stage with English names. Sega sold the international version in Japan as De La Jet Set Radio. Ueda was unhappy about the changes, which he said diminished the essential Japanese elements of the game. Soundtrack The Jet Set Radio soundtrack includes original and licensed tracks with a variety of genres including J-pop, hip hop,