Song materials for Guitar Hero III: Legends of Rock are similar to those of previous titles. While the player must use the game's guitar controller to perform on-screen notes, it is also possible to perform these notes on a guitar. The song notes are labeled with the corresponding fret buttons on the guitar controller, which are mapped to the corresponding notes on the fretboard. All 21 fret buttons on the guitar controller are available for in-game performance, and the player can use as many as four of the fret buttons to form chords. The game also introduces new guitar controllers, which feature a plastic laminate and require the player to learn how to strike the strings with the plastic bar of the controller. The guitar controllers are available for use in all modes except Co-Op Career mode. In this mode, the player must use the bass or rhythm guitar controller. After completing a song, the player can play a challenge mode with a different set of notes, which is played in place of the song. Challenges can be played in all four difficulty levels and in progressive order, allowing the player to explore different challenges and earn additional songs.
The game also features Star Power, a feature exclusive to the game's multiplayer Battle mode. When the player has enough Star Power, they can activate it and further double the scoring multiplier either by tilting the guitar controller vertically or by pressing a specific button on the controller. The player can access Star Power only in Battle mode.
The game features four difficulty levels of gameplay difficulty, ranging from easy to expert. The difficulty levels affect the amount of multiplier that is earned when the player hits a note. For example, hitting a note at Expert is worth two times more than at Easy. Additionally, at each difficulty level, the number of notes required to earn a multiplier increases, and the length of a song increases as well. It has also been revealed that the difficulty can be increased by using the Guitar Cruise mode, which increases the number of notes available in a song. The mode is unlocked by completing all the songs in Easy, Medium, Hard, and Expert difficulty at the same time.
Neversoft developed the game for the PlayStation 3 and PlayStation Portable platforms. The game was released in September 2007 and October 2007, respectively. In addition to the standard version of the game, the PlayStation 3 and PlayStation Portable versions were released with a Guitar Hero III: Legends of Rock Rock Tour Edition, as well as a Guitar Hero III: Legends of Rock Rock Tour Edition Deluxe. The Rock Tour Edition is similar to the standard edition, but comes with a special guitar controller, gear rack, guitar, and set of tour sticks, as well as a special case to store the guitar and accessories. The Rock Tour Edition Deluxe includes the guitar controller, gear rack, guitar, and set of tour sticks, as well as a special hard case to store the guitar and accessories. The PlayStation 3 version of the Rock Tour Edition Deluxe also comes with a special hard case to store the guitar and accessories. The Xbox 360 version of the game does not have the Rock Tour Edition or Rock Tour Edition Deluxe versions; however, the game does include the tour concert set as a downloadable pack. The Xbox 360 version was released in December 2007, and the PlayStation 3 and PlayStation Portable versions were released in December 2007 and January 2008, respectively. In addition to the standard edition of the game, the PlayStation 3 and PlayStation Portable versions were released with the guitar controller and a special case to store the guitar and accessories. 827ec27edc