In it, series antagonist Doctor Eggman threatens to use a weapon to destroy the world and sends out legions of robots. The story is also simpler than those of the Sonic Adventure games. While the preceding Sonic Adventure games for the Dreamcast featured elements of action-adventure and exploration, Sonic Heroes focuses on linear platforming and action, similar to the Sonic the Hedgehog games for the Sega Genesis. Despite mixed reviews, it was a major commercial success, with 3.41 million copies sold by 2007. Critics, however, derided the game for not addressing the problems of previous series games, such as poor camera controls and voice acting. Reviewers also highlighted its graphic design and detailed environments and textures. They praised the game's focus on fast gameplay and noted its similarities to the series' original 2D entries, a choice that some considered an improvement from the Sonic Adventure games. Sega released Sonic Heroes in Japan in December 2003 and worldwide in early 2004.

The team revived elements not seen since the Genesis Sonic games, such as special stages and the Chaotix characters. The team wanted Sonic Heroes to appeal beyond Sonic series fans and so designed a game that did not depend on the continuation of its predecessors. Sonic Team USA's Yuji Naka and Takashi Iizuka led the game's 20-month development. The game was the first multi-platform Sonic game, produced for the GameCube, PlayStation 2, Windows, and Xbox platforms. Sonic Heroes abandons the action-adventure and exploration-based gameplay of its predecessors Sonic Adventure (1998) and Sonic Adventure 2 (2001) and instead returns to the linear style of Sega Genesis-era Sonic games. Within each level, the player switches between the team's three characters, who each have unique abilities, to overcome obstacles. The player races a team of series characters through levels to amass rings, defeat robots, and collect the seven Chaos Emeralds needed to defeat Doctor Eggman. Sonic Heroes is a 2003 3D platform game in Sega's Sonic the Hedgehog series.

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