To unlock any boss characters as playable character, simply beat them in the game and they will become unlocked.

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. To unlock the Bat Guitar, get five stars on each song during Career Mode on Easy difficulty. To unlock the track 'Through the Fire and Flames', beat the game.

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. To unlock the Neversoft Skateboard, complete Co-Op Mode on expert with five stars. To unlock the PendulAxe Bass, complete Co-op Mode on expert. To unlock the Tiki Guitar, complete Career Mode on hard with five stars. To unlock the El Jefe Guitar, complete Career Mode on expert with five stars. To unlock the Beach Life Bass, complete Co-op Mode on hard. 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. 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. Keep in mind that because you're strumming using four buttons, no sounds will play. 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 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. To make it impossible to fail a song, insert the following code in the in-game cheats menu.

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