Guitar Hero: Metallica Cheats

Cheat Codes
Select "Cheats" at the main menu, then "Enter New Cheat". Enter one of the following codes to unlock the corresponding cheat option at the menu. A message will confirm correct code entry.

Press Redx2, Blue, Yellow, Greenx3, Yellow: Air instruments
Press Redx3, Bluex2, Greenx2, Yellow: Always Drum Fill
Press Yellow, Red, Green, Red, Green, Redx2, Blue: Black Highway
Press Green, Red, Green, Blue, Redx2, Yellow, Blue: Flame Color
Press Blue, Redx2, Green, Red, Green, Red, Yellow: Gem Color
Press Green, Blue, Red, Yellowx2, Red, Greenx2: Hyperguitar, Hyperbass, and Hyperdrums
Press Green, Red, Yellowx3, Bluex2, Green: Invisible Rocker
Press Green, Red, Yellow, Bluex2, Yellow, Red, Green: Metallica Costumes
Press Yellowx2, Blue, Red, Blue, Green: Performance mode
Press Redx2, Yellow, Red, Blue, Red, Red, Blue: Star Color
Press Yellow, Green, Red, Bluex4, Red: This mode automatically plays the bass pedal for the drummer. It has no effect online.
Press Greenx2, Redx2, Yellow, Red, Yellow, Blue: This turns all guitar notes (not chords) into touch pad sliding notes connected by purple lines. It has no effect online
Press Green, Red, Yellow, Blue, Red, Yellow, Blue, Green: This unlocks additional Line 6 effects in the Music Studio
Press Red, Greenx2, Yellow, Blue, Green, Yellow, Green: Vocal Fireball

Unlockable Characters and Songs
"Broken, Beat & Scarred", "Cyanide", and "My Apocalypse": Beat "The Thing That Should Not Be" on any career mode
James Hetfield: Get 100 starts on Vocals Career Mode
James Hetfield Classic: Get 150 starts on Vocals Career Mode
James Hetfield ZOMBIE: Earn 200 stars in Vocal Career
King Diamond: Play "Evil" on any career mode
Kirk Hammet: Get 100 starts on Guitar Career Mode
Kirk Hammet Classic: Get 150 starts on Guitar Career Mode
Kirk Hammett ZOMBIE: Earn 200 stars in Guitar Career
Lars Ulrich: Get 100 starts on Drums Career Mode
Lemmy: Play "Ace Of Spades" on any career mode
Rob Trujillo Classic: Earn 150 stars in Bass Career
Rob Trujillo ZOMBIE: Earn 200 stars in Bass Career
Robert Trujillo: Get 100 starts on Bass Career Mode