Sonic Battle

Sonic Battle is the Beat-'em-up style game for the GBA.

Playable

 * Sonic the Hedgehog
 * Miles "Tails" Prower
 * Rouge the Bat
 * Amy Rose
 * Knuckles the Echidna
 * Cream the Rabbit
 * Shadow the Hedgehog
 * Emerl
 * E-102 Gamma (No episode)
 * Chaos (No episode)

Non-Playable/Unlockable

 * Doctor Eggman (Has to be unlocked using GameShark)

Other Characters

 * The Predsident (Not seen)

Arenas
All arenas except for Death Egg can be used in Multiplayer.
 * Emerald Beach (Sonic, Tails in Emerl's story)
 * Tails' Lab (Tails, enter to virtual training in Emerl's story)
 * Chao Ruins (Knuckles)
 * Battle Highway (Shadow)
 * Club Rouge (Rouge)
 * Amy's Room (Amy)
 * Library (Cream)
 * Metal Depot (Chaos Gamma)
 * Holy Summit (Chaos)
 * Death Egg (story mode)
 * Colosseum (Used during virtual training, only available during Emerl's story)
 * Green Hill (Has to be unlocked by completing story mode)

Story
About 4000 years ago, a sentient weapon was created by an ancient civilization. After being lost for millennia, the weapon, called a 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 planet's resident hero, Sonic the Hedgehog.

The Gizoid, which Sonic dubs 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 personality traits from all of the above. But while the gang is having fun raising their new mechanical toy, 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.

Trivia

 * Some fans think that Sonic Battle's story takes place after Shadow the Hedehog and before Shadow joined G.U.N., for in Shadow the Hedgehog, Shadow doesn't know of the ARK or Maria Robotnik, but in Sonic Battle he does.
 * Oddly, the seven Chaos Emeralds are all green in this game, and the Master Emerald does not have it's own separate sprite, while the shattered emerald has it's own sprite for the shards.
 * Strangely, when Sonic gets the Master Emerald, he states "A Master Emerald" but this might be a typo.
 * The story is later continued in Sonic Advance 3, followed by Sonic Chronicles: The Dark Brotherhood.