To unlock the Air Guitar, insert the following notes in the Options menu: Blue & Yellow, Green & Yellow x2, Red & Blue x2, Red & Yellow x2, Blue & Yellow, Green & Yellow x2, Red & Blue x2, Red & Yellow x2, Green & Yellow x2, Red & Yellow x2.
All Items Available
To make every item available at the in-game store, insert the following lengthy cheat at the in-game cheats menu. Keep in mind that because you're strumming using four buttons, no sounds will play. You'll have to check the store when you're done inserting the password to see if it worked: Green/Red/Blue/Orange, Green/Red/Yellow/Blue, Green/Red/Yellow/Orange, Green/Blue/Yellow/Orange, Green/Red/Yellow/Blue, Red/Yellow/Blue/Orange, Green/Red/Yellow/Blue, Green/Yellow/Blue/Orange, Green/Red/Yellow/Blue, Green/Red/Yellow/Orange, Green/Red/Yellow/Orange, Green/Red/Yellow/Blue, Green/Red/Yellow/Orange.
All Songs (Quick Play Mode)
To unlock all of the game's songs for Quick Play Mode, insert the following notes in the Options menu: Yellow & Orange, Red & Blue, Red & Orange, Green & Blue, Red & Yellow, Yellow & Orange, Red & Yellow, Red & Blue, Green & Yellow x2, Yellow & Blue x2, Yellow & Orange x2, Yellow & Blue, Yellow, Red, Red & Yellow, Red, Yellow, Orange.
Bat Guitar
To unlock the Bat Guitar, get five stars on each song during Career Mode on Easy difficulty.
Battle Lou in Easy Mode
To battle with Lou using Easy Mode notes, try the following. When the battle with Lou begins (on Expert Mode), strum without holding any frets down. When you lose, select the Tutorial option at the Game Over menu. Do the Guitar Battle Tutorial and play through it in its entirety. After the "Lesson Complete" message appears on-screen and the next fret board appears, pause the game and exit. This will bring you back to the Lessons menu.
From here, press the red button, which will bring you back to the list of songs. The battle with Lou should be highlighted. Choose the song, and Lou's note chart will be set to Easy Mode now. Your note chart will still be in Expert Mode, but Lou's will be in easy mode.
Beach Life Bass
To unlock the Beach Life Bass, complete Co-op Mode on hard.
Boss Characters
To unlock any boss characters as playable character, simply beat them in the game and they will become unlocked.
Bret Michaels of Poison
To make the singer on stage appear as Bret Michaels of Poison fame, insert the following code at the in-game cheats menu: Green & Red x3, Green & Blue x4, Red & Blue, Red x3, Red & Blue, Red x3, Red & Blue, Red x3.
Distant Visitor Guitar
To unlock any boss characters as playable character, simply beat them in the game and they will become unlocked.
Easy "Through The Fire And Flames"
In the Through The Fire And Flames introduction, before you start wrap a rubber band around Green. By doing this, you will not have to worry about holding Green; it does it for you. Make sure you press the other buttons quickly so that Green can register. If you hold the buttons as you do the hammer-ons, Green will not register, and you will fail.
Easy battle power survival
When in a battle (either online or in Career mode), if you are playing against your opponent under the same difficultly setting, when they attack you with their battle power, look at their side of the screen. The notes will be the same and easy to see.
Easy Online mode
During an online vs. match (Face Off), the meter bar in the middle of the screen shows who is winning by the most points. To get more points, hold the whammy bar down while you play. The whammy bar gets you more points on long notes, but on short ones it is hard to hit. Hold the whammy bar to get all of them.
El Jefe Guitar
To unlock the El Jefe Guitar, complete Career Mode on expert with five stars.
Guitarists
You can unlock Tom Morello (of Rage Against the Machine), Slash (of Guns N Roses/Velvet Revolver), Lou (the Devil in the game), and a character called MetalHead by beating them in the game and then purchasing them for $10,000 (Lou costs $15,000).
Hammering on and pulling off
Hammering On and Pulling Off happens when you can strum on one note and successfully hit the notes that come after it without using the strum bar. Look for the single notes with white rings on top instead of black rings. As long as you hit the previous note, you can hit the next note by pressing the correct fret button. This is especially useful on songs like Cult of Personality under the Hard difficulty setting.
Hyperspeed
To unlock Hyperspeed, go to the in-game cheat menu (found under Options) and insert the following cheat on your guitar: Orange, Blue, Orange, Yellow, Orange, Blue, Orange, Yellow.
Iron Maiden reference
"22 Acadia Avenue" is a song name by the band Iron Maiden. You can see this in the first venue of Career mode.
Jolly Roger Guitar
To unlock the Jolly Roger Guitar, get five stars on each song during Career Mode on Medium difficulty.
Moon Shot Guitar
To unlock the Moon Shot guitar, complete Career Mode on Easy.
Nemesis 13 Guitar
To unlock the Nemesis 13 Guitar, complete Co-Op Career Mode on any difficulty.
Neversoft Skateboard
To unlock the Neversoft Skateboard, complete Co-Op Mode on expert with five stars.
No Failure
To make it impossible to fail a song, insert the following code in the in-game cheats menu. Keep in mind that this cheat will not work in Career Mode: Green & Red, Blue, Green & Red, Green & Yellow, Blue, Green & Yellow, Red & Yellow, Orange, Red & Yellow, Green & Yellow, Yellow, Green & Yellow, Green & Red.
PendulAxe Bass
To unlock the PendulAxe Bass, complete Co-op Mode on expert.
Performance Mode
To unlock Performance Mode, insert the following notes in the Options menu: Red & Yellow, Red & Blue, Red & Orange, Red & Blue, Red & Yellow, Green & Blue, Red & Yellow, Red & Blue.
Precision Mode
To unlock Precision Mode, insert the following notes in the Options menu: Green & Red x3, Red & Yellow x2, Red & Blue x2, Yellow & Blue, Yellow & Orange, Yellow & Orange, Green & Red x3, Red & Yellow x2, Red & Blue x2, Yellow & Blue, Yellow & Orange x2.
Predator reference
There is a reference to the movie Predator in the song "Helicopter". After playing the song, go to the "More Stats" screen, or to Practice mode and get to the screen where you choose what section to play. One of the sections in the song is called "Get Back To The Choppa!!!" which seems to be a reference to Arnold Schwarzenneger's line in Predator, when they are all running away from the Predator.
Rojimbo Guitar
To unlock the Rojimbo Guitar, complete Career Mode on Hard difficulty.
Saint George Guitar
To unlock the Saint George guitar, complete Career Mode on Medium.
Slash, Lou, and Tom Morello
To unlock these 3 characters, simply beat them in career mode and then buy them from the shop.
Unlockable
How to Unlock
Lou
Defeat this boss and you can buy him for $15,000
Slash
Beat him then you can buy him for $10,000
Tom Morello
Beat him then buy him for $10,000
Songs
The following songs can be unlocked in the game:
An Endless Sporadic - "Impulse"
Backyard Babies - "Minus Celsius"
Bret Michaels Band - "Go That Far"
Die Toten Hosen - "Hier Kommit Alex"
Dragonforce - "Through the Fire and the Flames"
Fall of Troy - "FCP Remix"
Gallows - "In the Belly of a Shark"
The Hellacopters - "I'm in the Band"
Heroes del Silencio - "Avalancha"
In Flames - "Take This Life"
Kaiser Chiefs - "Ruby"
Killswitch Engage - "My Curse"
LA Slum Lords - "Down N Dirty"
Lacuna Coil - "Closer"
Lions - "Metal Heavy Lady"
NAAST - "Mauvis Garcon"
Prototype - "The Way It Ends"
Revolverhead - "Generation Rock"
Rise Against - "Prayer of the Refugee"
Scouts of St. Sebastian - "In Love"
Senses Fail - "Can't Be Saved"
The Sleeping - "Don't Hold Back"
The Stone Roses - "She Bangs the Drums"
Superbus - "Radio Song"
Songs (Normal)
To unlock songs in the normal fashion, simply pass the song successfully. It will thereafter be unlocked.
Through the Fire and Flames
To unlock the track "Through the Fire and Flames", beat the game.
Tiki Guitar
To unlock the Tiki Guitar, complete Career Mode on hard with five stars.