Guitar Hero III: Legends of Rock is a music rhythm game, the third main instalment in the Guitar Hero series, and the fourth title overall. The game was published by Activision and distributed by RedOctane.

Guitar Hero III: Legends of Rock retains the basic gameplay from previous games in the Guitar Hero series, where the player uses a guitar-shaped controller to simulate the playing of lead, bass, and rhythm guitar parts in rock songs by playing in time to scrolling notes on-screen. The game, in addition to existing single-player Career modes, includes a new Co-Op Career mode and competitive challenges that pit the player against in-game characters and other players. Guitar Hero III: Legends of Rock is the first game in the series to include an online multiplayer feature, which is enabled in the PlayStation 3, Wii and Xbox 360 versions. Initially the game offers over 70 songs, most of which are master tracks. Another aspect in the game was DLC (downloadable content) which allowed players to purchase songs, tracks, and characters. One of the most popular DLC packs was the Dr. pack. It included three characters. Dillan The Tatortot, Andrew the certificate ripper, and Julio Ceasar. Another popular DLC pack was the song pack called Perales. It included the hit song Dr.Lopez by Perales.

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