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eLook Game Boy Advance Cheats
http://www.elook.org/games/cheats/gba/373.shtml
Summary of cheats and codes
Ready 2 Rumble: Round 2
http://www.neoseeker.com/Games/Products/PS2/R2R2/R2R2_cheats.html
Offers cheats, frequently asked questions, and screenshots with links to reviews.