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Downloaded more than 30 million times, across different mobile platforms and 12 million of these are paid downloads on iPhones, iPads, and iPod Touches. On Android the game is absolutely free and supported by advertisement. Some great advice by Peter Vesterbacka, “The Mighty Eagle of Rovio,” to share insights into the creation of this mobile game and advice for developers on how to think about building a mobile business.

Source: Google