Rovio had already shifted to primarily free games and ad revenue.But releasing a pay-to-play remake of the original Angry Birds game put a dent in the earnings of its many ad-supported sequels.The paid-for Angry Birds version charges players 99 cents for 390 ad-free levels.It's currently the App Store's second-best-selling paid download, but it only nets Rovio an estimated $30,000 in monthly revenue.
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