<P> Sonic Adventure 2 is a 2001 platform game developed by Sonic Team USA and published by Sega . The sequel to Sonic Adventure, it was the final Sonic the Hedgehog game for the Dreamcast after Sega discontinued the console . It features two good - vs - evil stories: Sonic the Hedgehog, Miles "Tails" Prower and Knuckles the Echidna attempt to save the world, while Shadow the Hedgehog, Doctor Eggman and Rouge the Bat attempt to conquer it . The stories are divided into three gameplay styles: fast - paced platforming for Sonic and Shadow, multi-directional shooting for Tails and Eggman, and action - exploration for Knuckles and Rouge . </P> <P> Development of Sonic Adventure 2 began following the completion of its predecessor . Development took 18 months; it was produced in commemoration of the Sonic series' tenth anniversary and was designed to be faster - paced and more action - oriented than the original . The development team also expanded upon the presence of the Chao creatures and other player characters . Its locations were influenced by American locations such as San Francisco and Yosemite National Park . The game was announced in October 1999 and was exhibited at E3 2000 . It was released worldwide in June 2001 . </P> <P> Sonic Adventure 2 was critically acclaimed, with many even calling it the best game in the Sonic series . It received praise for its gameplay variety, visuals, and audio, though some criticized its camera, voice acting, and plot . An enhanced port for the GameCube, Sonic Adventure 2 Battle, was released worldwide in 2002; this version features improved textures and multiplayer options . Sonic Adventure 2 was also released as a downloadable game for the PlayStation 3, Xbox 360, and Windows in October 2012 . </P> <P> Sonic Adventure 2 is a 3D game with six playable characters, divided into two campaigns: Hero (with Sonic, Tails and Knuckles the Echidna, where the player battles to save the world) and Dark (with Shadow the Hedgehog, Doctor Eggman and Rouge the Bat, where they battle to conquer it). Each character on each side has a playing style similar to the other characters on the side . The player moves through the Hero and Dark campaigns, switching between them at will . Each campaign cycles through levels of its three characters, telling different sides of the story . Levels have a variety of themes (such as cities, jungles, desert pyramids and outer space), with some followed by boss fights . The two campaigns' stories occur in parallel; completing both campaigns unlocks a Last Story with all six characters, culminating in a final boss fight . </P>

What's the difference between sonic adventure 2 and battle