London - Activision's (NASD: ATVI) "Guitar Hero: World Tour" sold 3.4 million copies in the U.S. last year, or twice as many as MTV Networks' (NYSE: VIA) "Rock Band 2," which moved 1.7 million units, GameSpot reported, citing new data from market research firm NPD Group. The report notes that "Rock Band 2" did not become available for the PlayStation 3 or Nintendo Wii until shortly before the holidays.

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