Guitarist uses Air Guitar
At the main menu, quickly press Yellow(2), Blue, Orange, Yellow, Blue. If you entered the code correctly, a message will appear. Repeat this code to disable its effect.

Guitarist has flaming head
At the main menu, quickly press Orange, Yellow, Orange(2), Yellow, Orange, Yellow(2). If you entered the code correctly, a message will appear. Repeat this code to disable its effect.

Guitarist has horse head
At the main menu, quickly press Blue, Orange(2), Blue, Orange(2), Blue, Orange(2), Blue. If you entered the code correctly, a message will appear. Repeat this code to disable its effect.

Audience has eyeball heads
At the main menu, quickly press Blue, Orange, Yellow, Orange, Yellow, Orange, Blue. If you entered the code correctly, a message will appear. Repeat this code to disable its effect.

Audience has monkey heads
At the main menu, quickly press Orange, Blue, Yellow(2), Orange, Blue, Yellow(2). If you entered the code correctly, a message will appear. Repeat this code to disable its effect.

Hyper Speed mode
At the main menu, quickly press Orange, Blue, Orange, Yellow, Orange, Blue, Orange, Yellow. If you entered the code correctly, a message will appear. In this mode, the frets will move faster. Repeat this code to disable its effect.

Performance mode
At the main menu, quickly press Yellow(2), Blue, Yellow(2), Orange, Yellow(2). If you entered the code correctly, a message will appear. In this mode, everything disappears except for the performance. Repeat this code to disable its effect.

Pro Face-Off mode
Successfully complete the game on the Medium difficulty setting to unlock Pro Face-Off mode. This mode allows two players to play all the notes.

Bonus basses
Successfully complete the indicated number of songs in Co-Op mode to unlock the corresponding bass at the shop for Co-Op mode:

Gibson Grabber: 20 songs
Gibson SG: 10 songs
Gibson Thunderbird: 30 songs
Lava Pear Musician Stingray: 21 songs with a five star rank on the Hard difficulty setting

Bonus guitars
Successfully complete the indicated task to unlock the corresponding guitar at the shop:

Battle Axe: Successfully complete the game on the Expert difficulty setting.
Casket: Successfully complete the game on the Medium difficulty setting.
Fish: Successfully complete the game on the Easy difficulty setting.
Eyeball: Get a five star rank on all songs on the Hard difficulty setting.
Snaketapus: Successfully complete the game on the Hard difficulty setting.
The Log: Get a five star rank on all songs on the Expert difficulty setting.
U.S.A.: Get a five star rank on all songs on the Easy difficulty setting.
Viking: Get a five star rank on all songs on the Medium difficulty setting.

Bonus songs
Get a perfect rank on any song to unlock the hidden song for that set:

Tonight, I'm Gonna Rock You Tonight: Second set

Golden five stars
Get every note correct on a song to get five golden stars. Note: This does not earn you any extra money in Career mode.

Full Rock meter
Start a song and max out the Rock meter, then reset the song to start with a full rock meter.

Play the Scythe with most characters
Unlock the Grim Ripper and select him as your guitarist. Then, select another character whose alternate costume is already unlocked and they will have the Scythe unless you change the guitar. Note: Since Clive Winston and Xavier Stone do not have an unlockable costume, they cannot play the Scythe.

Grim Ripper plays Gibson Les Paul
Unlock the Grim Ripper and select him as your guitarist in Career mode, then exit Career mode. Next, go to Quick Play mode, choose any song on any difficulty, and either finish the song or quit once it has started. Then, go back to Career mode and the Grim Ripper will be playing the Gibson Les Paul with the Cherry Sunburst Classic skin. To make him play the Scythe again, simply select it in the "Change Guitar" menu.

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