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In "Sonic Battle" for the Game Boy Advance, players can enjoy both single and multi-player gameplay modes -- Story, Challenge and Battle -- as well as five multi-player Mini Games. Players will also have the ability to fight as one of eight characters (plus two hidden) including Sonic, Tails, Knuckles and Shadow. Sonic fans will be able to select one of eleven arenas (plus one hidden), set the rules and customize attacks. In Story mode, players can develop their own AI fighting partner. "Sonic Battle" also features four-player battles using the Game Boy Advance® Game Link® Cable. ^
About 4000 years ago, a sentient weapon was created by an ancient civilization. After being lost for millennia, the Gizoid was unearthed and researched by Prof. Gerald Robotnik. It remained dormant for another half century before being discovered by, of all people, resident would-be ruler of the world and Gerald's grandson, Dr. Eggman. Frustrated at his inability to get the dormant Gizoid to work properly, Eggman dumped the contraption at Emerald Beach... where it was discovered once again, this time by legendary hero Sonic the Hedgehog. The Gizoid, which Sonic names Emerl, gets wrapped up in the affairs of Sonic's friends, allies and rivals. Through his encounters with Sonic, Tails, Knuckles, Amy, Cream, Rouge, and Shadow, Emerl grows and evolves from a soulless robot into a fun-loving mech with lots of personality. But while the gang is having fun raising their new mechanical friend, there are those who recognize Emerl's true power... Now that the Gizoid is working again, Eggman's got his eye on it, Rouge wants to turn it into a master thief, and Shadow senses that, despite their efforts to humanize him, Emerl is still designed and programmed to be a weapon of mass destruction (and he also believes the same for himself). This is proven in the last fight, where Emerl fights Eggman and reveals his dark side. He is about to destroy the world when Sonic comes and destroys it. Emerl tells everyone that he was thankful for meeting them, and how such good friends they were. Emerl mechanically combusts, leaving the game at a sad note.