of combat elements to differentiate him from the other characters. Shadow's gameplay was further fleshed out with the addition of vehicles; each vehicle uses its own physical engine. The game also features several CGI cutscenes produced by Blur Studio. Animation supervisor Leo Santos said Blur faced challenges animating the opening scene due to the placement of Sonic's mouth. As development progressed, Sonic Team faced serious problems. In March 2006, Naka resigned as head of Sonic Team to form his own company, Prope. Naka has said he resigned because he did not want to continue making Sonic games and instead wished to focus on original properties. With his departure, "the heart and soul of Sonic" was gone, according to former Sega of America CEO Tom Kalinske. Sonic the Hedgehog was originally intended for release on all major seventh-generation consoles as well as Windows, but Sega was presented with development kits for Nintendo's less powerful Wii console. Sega believed porting the game to Wii would take too long, and so conceived a Sonic game that would use the motion detection function of its controller. Therefore, the team was split in two: Nakamura led one team to finish Sonic the Hedgehog for Xbox 360 and PlayStation 3 while producer Yojiro Ogawa led the other to begin work on Sonic and the Secret Rings for the Wii. The split left an unusually small team to work on Sonic the Hedgehog. Sega pressured the team to finish the game in time for the 2006 holiday shopping season, so with the deadline quickly approaching, Sonic Team rushed the final stages of development, ignoring bug reports from Sega's quality assurance department and control problems. In retrospect, Ogawa noted that the final period proved to be a large challenge for the team. Not only was the Xbox 360 release imminent, but the PlayStation 3 launch was scheduled not long afterwards. This put tremendous pressure on the team to develop for both systems. Producer Takashi Iizuka similarly recalled, "we didn't have any time to polish and we were just churning out content as quick as we could." Audio The cast of the Sonic X anime series reprised their voice roles for Sonic the Hedgehog, and actress Lacey Chabert supplied the voice of series newcomer and damsel in distress Princess Elise. The score for the game was primarily composed by Tomoya Ohtani along with Hideaki Kobayashi, Mariko Nanba, Taihei Sato,