How to Make the Free-to-Play Model Work for You : Great examples from Gaia(freetoplay.biz)
freetoplay.biz
How to Make the Free-to-Play Model Work for You : Great examples from Gaia
http://freetoplay.biz/2009/09/17/how-to-make-the-free-to-play-model-work-for-you-gdc-austin-2009/
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