GameFAQs - Includes information, FAQs, guides, cheats, reviews, downloads, and a message board. - http://www.gamefaqs.com/portable/gbadvance/data/914720.html
Open Site - Contains information and review overviews. - http://open-site.org/Games/Video_Games/Platform/Sonic_the_Hedgehog_Series/Sonic_Battle/
GameSpot - Includes information, news, screenshots, links, previews, and a review. - http://www.gamespot.com/gba/action/sonicbattle/
Sonic Battle X - Provides information, forums, guides, downloads, and links. - http://www.planetnintendo.com/sonicbattle/