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eLook
http://www.elook.org/games/cheats/gamecube/57.shtml
Summary of cheats and codes.
Game Revolution
http://www.game-revolution.com/games/codes/gamecube/batman_vengeance.htm
Contains cheats for the game.
Lunabean.com
http://www.lunabean.com/nintendo/gcn_bv.html
Cheats, level hints, and message boards.