In the main menu select "Option", "Cheats", "Enter the new cheat", and the input code. Press the green color that is in the "Cheats" menu to turn off the code
Air guitar :
Press Red+Yellow, Green+Red, [Red+Yellow]2x, [Red+Blue]5x,[Yellow+Blue]2x, Yellow+Orange
Hyperspeed :
YO,YO,YO,YO,YO,RY,RY,RY,RY,RB,RB,RB,RB,RB,YB,YO,YO
Large Gems :
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
