MobyGames
- User contributed description, ratings, reviews, screenshots, trivia, secrets, technical specifications, and credits.
- http://www.mobygames.com/game/metroid-fusion

eLook
- Unlockable content.
- http://www.elook.org/games/cheats/gba/346.shtml

CCG: Metroid Fusion
- Contains hints and unlockables.
- http://www.cheatscodesguides.com/gameboy-advance-cheats/metroid-fusion/

GameFAQs
- Contains FAQs covering walkthrough, challenges, bosses, item locations, maps, and endings.
- http://www.gamefaqs.com/portable/gbadvance/data/516709.html

GameSpy
- Information, screenshots, and a review.
- http://gba.gamespy.com/gameboy-advance/metroid-fusion/

IGN
- Screenshots, videos, news, previews, message board, and a review.
- http://gameboy.ign.com/objects/016/016227.html

GameSpot
- Reviewed by: Greg Kasavin, [8.6/10]. "Metroid fans should absolutely get it, as should anyone willing to trade off some quantity for some serious quality in their gaming time." Also includes news, preview, screenshots, and hints.
- http://www.gamespot.com/gba/action/metroidfusion/

GameZone
- Review by Louis Bedigian, 95%. "The new gameplay concepts, new levels and new music and graphic effects are outstanding."
- http://gameboy.gamezone.com/gzreviews/r20483_GBA.htm