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"OUYA will soon let developers choose whether or not to include free content. Since the platform's launch, customers have been able to try out any game before making a purchase, but some devs have been pushing back, requesting that OUYA allow them to make that call on their own. While free content certainly has its advantages, game makers have outlined several reasons why a free-to-try model may not be practical. Creating demo content costs money, of course, and in some cases, it's difficult to fit a selection of free gameplay within an existing storyline. It's not entirely clear when the policy change will take effect, so if you've been taking advantage of OUYA demo content, enjoy it while it lasts."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2014/03/20/ouya-free-games/>