Guitar Hero II
Enter the following on the main menu
Y=Yellow, B= Blue, O=Orange,R=Red
Air Guitar: YBYOYB
Hyperspeed: BOYOBOYY
Eyeball Head Crowd: YOBBBOY
Flaming heads: OYYOYYOYYBYYBYY
Monkey head crowd: OYBBYOBB
Perfomance Mode: BBYBBOBB
Unlock all songs: BYOROYRYRYRYRYRY