NCsoft and ArenaNet's MMO series Guild Wars has sold over six million units, the publisher has announced.

The franchise originally launched in 2005, and will celebrate four years of play on April 28.

"We are humbled by how gamers have responded to Guild Wars over the past four years, and we are proud that the game and its community have helped to continually shape, define, and expand the genre," commented ArenaNet studio head Mike O’Brien.

"Our subscription-free business model has proven to be a big hit with gamers, bringing an enormous and diverse online community to the game."

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