You may recall a similar headline from the past, where the Guitar Hero franchise earned over $1 billion. Well, another milestone for Activision comes thanks to the previous title to release in the franchise, Guitar Hero III: Legends of Rock. That game alone has generated over $1 billion in sales, making it the first game in history to do so. The news was presented by Activision Publishing CEO Mike Griffith during a keynote speech at CES. We're not sure how much an impact the Wii version itself has had, but consider it to be significant. The Wii version of the game has been very popular for quite some time now. Well, up until World Tour released, anyway.