From the main menu, go to “Options”, then “Cheats”, then “Enter Cheat”. Then play the following notes, you must strum every note/chord.

(G=Green, R=Red, Y=Yellow, B=Blue, O=Orange)

Code Effect
(BY) (GY) (GY) (RB) (RB) (RY) (RY) (BY) (GY) (GY) (RB) (RB) (RY) (RY) (GY) (GY) (RY) (RY) Air Guitar
(GR) (GY) (YB) (RB) (BO) (YO) (RY) (RB) Easy Expert (does not work in Career mode)
OBOYOBOY Hyperspeed
G R G Y G B G O G B G Y G R G (GR) (RY) (GR) (YB) (GR) (BO) (GR) (YB) (GR) (RY) (GR) (GY) Large Gems
(GR) B (GR) (GY) B (GY) (RY) O (RY) (GY) Y (GY) (GR) No Fail (does not work in career mode)
(RY) (RB) (RO) (RB) (RY) (GB) (RY) (RB) Performance Mode
(GR) (GR) (GR) (RY) (RY) (RB) (RB) (YB) (YO) (YO) (GR) (GR) (GR) (RY) (RY) (RB) (RB) (YB) (YO) (YO) Precision Mode
(YO) (RB) (RO) (GB) (RY) (YO) (RY) (RB) (GY) (GY) (YB) (YB) (YO) (YO) (YB) Y R (RY) R Y O Unlock all songs in Quick Play
(GRBO) (GRYB) (GRYO) (GYBO) (GRYB) (RYBO) (GRYB) (GYBO) (GRYB) (GRYO) (GRYO) (GRYB) (GRYO)