How can i use cheat codes for guitar hero 2?

Answer 1

These are for the PS2: Guitar Hero 2 Codes !

Code Effect
Y,Y,B,O,Y,B Air Guitar
B,O,Y,O,Y,O,B Crowd has Eyeball Heads
O,B,Y,Y,O,B,Y,Y Crowd has Monkey Heads
O,Y,O,O,Y,O,Y,Y Flaming Head
B,O,O,B,O,O,BO,O,B Horse Head
Orange, Blue, Orange, Yellow, Orange, Blue, Orange, Yellow Hyper Speed De/Activate
Yellow, Yellow, Blue, Yellow, Yellow, Orange, Yellow, Yellow Performance mode (Guitar God Mode?)
B,Y,O,R,O,Y,R,Y,R,Y,R,Y,R,Y Unlock All (NTSC Version)

Hyperspeed on Dualshock

Just do the sequence on the main menu (while selecting "Career Mode"). And keep doing it repeatedly until a message appears. Don't do it too slow.
Code Effect
Triangule, Square, X, Square, Triangule, Square, X, Square until a message appears Activates the Hyperspeed