Guitar Freaks Cheat Codes for Arcade

High Speed Edition
Press Pick (x2), Red, Blue, Red, Blue, Green (x2) at the mode select screen. Then choose Expert mode. (A cheering crowd confirms correct entry.)

Speed Edition
Press Red, Green, Blue, Pick (x2) at the mode select screen. Then choose Expert mode. (A cheering crowd confirms correct entry.)

2P Battle mode
Press Pick, Green (x2), Pick at the mode select screen. (A cheering crowd confirms correct entry.)

Hidden mode
Press Red, Blue, Green, Blue, Red, Green at the mode select screen. (A cheering crowd confirms correct entry.)