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My son's got a Kurio 7 tablet. I've installed the Amazon App Store on it and noticed not all apps are compatible. Bad Piggies for example won't install. The Amazon App Store says its not compatible with his device. Why is that? Bad Piggies is supposed to support Android 2.2 and the Kurio 7 has Android 4. Other than that it doesn't say anything about the requirements. What other things can make an Android device incompatible with some apps?