Just in time for their fourth anniversary celebrations, ArenaNet have announced that Guild Wars has sold over six million copies. Coincidence? We think not but it's still a remarkable milestone for this popular MMO. Remember that market leader World of Warcraft has 11.5 million players worldwide and is subscription based. Guild Wars meanwhile, is free-to-play (plus box costs) and only a few months younger than WoW.

ArenaNet are understandably chuffed about the whole thing, particularly their studio head, Mike O'Brien: "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. Our subscription-free business model has proven to be a big hit with gamers, bringing an enormous and diverse online community to the game."