Free-to-play is the driving force in today's mobile and social games — we start playing them because there is no cost to do so. Whether or not we keep playing them may well depend on the 15 rules of free-to-play outlined by Gamesbrief's Nicholas Lovell earlier today at the F2P Summit in London. »9/26/12 10:55am 9/26/12 10:55am
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