Sonic Adventure  Following the cancellation of the Sega Saturn game "Sonic X-treme", Sonic Team began work on "Sonic Adventure" in 1997. A 60-member development team created the game in ten months, drawing inspiration from locations in Peru and Guatemala. Yuji Uekawa redesigned the characters for their transition to 3D, and features were added to take advantage of the Dreamcast hardware. Sega announced the game in August 1998; it was released in Japan that December and worldwide in September 1999. "Sonic Adventure" was ported to the GameCube and Windows in 2003 as "Sonic Adventure DX: Director's Cut", featuring updated graphics and more challenges. A high-definition version was released digitally for the PlayStation 3 and Xbox 360 in 2010, and for Windows in 2011. "Sonic Adventure" received critical acclaim and, with 2.5 million copies sold by August 2006, became the Dreamcast's bestseller. Reviewers lauded the visuals and gameplay, calling it a major technological advancement; some speculated that it could re-establish Sega as the dominant console manufacturer after the relatively unsuccessful Saturn. Others were frustrated by the camera controls and glitches, and reactions to its audio were mixed. Reviews for later releases were less positive; critics felt the game had not aged well and ran at an inconsistent frame rate. Despite this, journalists have ranked "Sonic Adventure" among the best "Sonic" games, and it is recognized as an important release in both the series and the platform genre. A sequel, "Sonic Adventure 2", was released in 2001. "Sonic Adventure" is a 3D platform game with action and role-playing elements. Players control one of six anthropomorphic protagonists as they venture to defeat Doctor Robotnik and his robot army, who seek the seven magical Chaos Emeralds and the evil entity Chaos. Six player characters are unlocked as the game progresses, each with their own story and attributes. Sonic the Hedgehog performs a spin dash, homing attack, and light-speed dash; Miles "Tails" Prower flies, swims, and attacks robots using his tails; Knuckles the Echidna glides, climbs walls, and punches; Amy Rose can defeat enemies using her hammer; Big the Cat is slow and carries a fishing rod he can cast; and E-102 Gamma can shoot laser beams. At the start of the game, the player is placed in one of several Adventure Fields, open-ended hub worlds inhabited by advice-giving non-player characters.