• Snaketapus Guitar: Complete Hard Mode.
• The Log" Guitar: You must achieve 5-Star every song on Expert.
• Battle Axe Guitar: Complete Expert Mode.
• Casket Guitar: Complete Medium Mode.
• Eyeball Guitar: You must achieve 5-Star every song on Hard.
• Fish Guitar: Complete Easy Mode.
• USA Guitar: You must achieve 5-Star every song on Easy.
• Viking Guitar: You must achieve 5-Star every song on Medium.

Unverified. On the main menu, directly depress the colored key without any other input.

Performance Mode ... YELLOW, YELLOW, BLUE, YELLOW, YELLOW, ORANGE, YELLOW, YELLOW
Hyper Speed ... ORANGE, BLUE, ORANGE, YELLOW, ORANGE, BLUE, ORANGE, YELLOW
Air Guitar ... YELLOW, YELLOW, BLUE, ORANGE, YELLOW, BLUE
Eyeball Heads ... BLUE, ORANGE, YELLOW, ORANGE, YELLOW, ORANGE, BLUE
Moneky Heads ... ORANGE, BLUE, YELLOW, YELLOW, ORANGE, BLUE, YELLOW, YELLOW
Flaming head ... ORANGE, YELLOW, ORANGE, ORANGE, YELLOW, ORANGE, YELLOW, YELLOW
Horse head ... BLUE, ORANGE, ORANGE, BLUE, ORANGE, ORANGE, BLUE, ORANGE, ORANGE, BLUE
Hyper Speed ... ORANGE, BLUE, ORANGE, YELLOW, ORANGE, BLUE, ORANGE, YELLOW

PAL version Codes
PAL region has different codes from the NTSC version of Guitar Hero 2.

Air guitar ... BLUE, YELLOW, ORANGE, BLUE, YELLOW, YELLOW
Eyeball Heads ... YELLOW, ORANGE, BLUE, ORANGE, BLUE, ORANGE, YELLOW
Hyper Speed ... YELLOW, ORANGE, BLUE, ORANGE, YELLOW, ORANGE, BLUE, ORANGE
Monkey Heads ... YELLOW, YELLOW, BLUE, ORANGE, YELLOW, YELLOW, BLUE, ORANGE
Flaming Head ... YELLOW, YELLOW, ORANGE, YELLOW, ORANGE, ORANGE, YELLOW, ORANGE
No HUD performance mode ... YELLOW, YELLOW, ORANGE, YELLOW, YELLOW, BLUE, YELLOW, YELLOW

... B, O, O, B, O, O, B, O, O, B, O, O, B, O, O, B, O - Horse Head

Submitted by l0n3ly_w17h0u7_h3r
Addition by Bobby Bird (teko101)

Complete the game on medium or higher

Unverified. First, unlock the Ripper in Career Mode. Switch to to the difficulty you intend to play on, and select your desired guitarist. Switch to a different difficulty and select the Grim Ripper. Now, switch back to the difficulty you intended to play on. The poster should read "your guitarist" playing the "Scythe."

As long as you do not change your guitar or character, your guitarist will be using the Scythe on each song of that difficulty. To return your guitarist to non-lethal guitars, simply change your guitar in the "change guitar" menu.

A similar process can equip the Ripper with a mortal guitar. Move onto your preferred difficulty as the Grim Ripper. Go to any other difficulty, select your desired guitar on any character (besides the Ripper), then return to your preferred difficulty.

Here is how you can unlock additional Basses in Co-Op mode

Gibson SG Bass - Beat 10 Songs

Gibson Grabber - Beat 20 Songs

Gibson Thunderbird - Beat 30 Songs

Gibson Les Paul and skin - Beat 40 Songs

Hofner Bass - Beat every song

Lava Pearl Musicman Stingray - Get 5 stars on at least 10 songs

Cream SG - Get 5 stars on 20 songs

Natural Sunburst Gibson Thunderbird Bass - Get 5 stars on every co-op mode song (stacks with below)

Natural Maple Gibson Grabber Bass - Get 4 stars on all co-op mode songs