Editor’s note: John Gaudiosi, a widely published columnist about the video game industry, writes the Gaming Guru blog for WRAL.com.

CARY –  Activision’s Guitar Hero II: Legends of Rock is already a smash hit.

The game sold over $115 million worth of product in its first seven days, making it the biggest game of all time for publisher Activision.

Although there will be more copies of Guitar Hero III, which is available for PlayStation 3, PlayStation 2, Xbox 360 and Wii, then ever before; it’s unlikely Activision will be able to keep up with demand.

That means that if you see one of these large boxes at retail – the game comes with a wireless guitar – grab it. It’s going to be one of the hottest Christmas presents of this year.

The new game introduces boss battles in the single-player tour and allows two players to battle against each other as a new multiplayer option. The wireless Les Paul guitars are a huge bonus, eliminating those long cables. Anyone who buys the Xbox 360 or PS3 version of the game will be able to get a steady stream of downloadable content to extend the life of the game.

Activision already has the first two music packs available online. The Velvet Revolver Track Pack includes master recordings of “Messages,” “She Builds Quick Machines” and the 2004 Grammy Award winner for Best Hard Rock Performance, “Slither.” The Foo Fighters Track Pack includes master recordings of “The Pretender,” “This Is a Call” and the 2002 Grammy Award winner for Best Rock Song, “All My Life.”

For those who didn’t get in on the Guitar Hero phenomenon early, Activision has just released a twin-pack of Guitar Hero 1 and 2 for PS2 for $60. The games still sell separately for $40 each. And beware of Guitar Hero Encore: Rocks the 80s. That game still sells for $50 and only includes 30 new songs. I suggest buying one of the next gen games so you can download new music on your own and pick what you want to play.