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Cheat Code Central
http://www.cheatcc.com/gc/pikmin.html
Contains strategy guide and cheats.
eLook
http://www.elook.org/games/cheats/gamecube/156.shtml
Contains a list of cheats.
Game Revolution
http://www.game-revolution.com/games/codes/gamecube/pikmin.htm
Contains cheats.
IGN
http://cheats.ign.com/ob2/068/016/016510.html
Includes tips covering challenge mode, Pikmin production, and fireworks.
The Adrenaline Vault
http://www.avault.com/cheats/console/displaycheat.asp?game=ngc-pikmin&type=7
Provides cheats.