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Game Boy Frenzy
http://www.gbfrenzy.com/index2.asp
Tips, tricks, and cheats.
Red Hot Code Saves
http://www.rhcodesaves.com
Code saves for the Action Replay cheating device.
Tipland
http://www.gameboy.tipland.co.uk/
Cheats and game tips.
Total Game Boy Cheats
http://www.total-cheats.com/gb/
Contains a database of cheats and codes.