Specifics of the deal from Amazon:
"For a limited time, customers who download Hay Day from Amazon Appstore between August 1, 2016 and August 31, 2016 will receive a $10 credit toward purchase of digital content in Amazon Appstore. Only customers who have not previously downloaded Hay Day from Amazon Appstore are eligible for this offer. Please note, it may take up to 48 hours for you to receive an e-mail confirming that the $10 Amazon credit has been applied to your account."
Note the Appstore is Android only, no iphone.
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