No Fail Cheat
1. At the " enter cheat " screen type in the following buttons( while also strumming ) : Green+Red, Blue, Green+Red, Green+Yellow, Blue, Green+Yellow, Red+Yellow, Orange, Red+Yellow, Green+Yellow, Yellow, Green+Yellow, Green+Red. If you entered the cheat correctely, it should say " no fail cheat unlocked ".
More tricks, tips and cheats for this game are right here - Guitar Hero 3: Legends of Rock cheats
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