Amazon is currently running a promotion where you will receive $10 in Amazon Appstore Credit for downloading the game Hay Day. Unfortunately, the game is not compatible with Fire TV devices, so you’ll need to have a compatible Android phone or tablet. It’s unclear if “purchasing” the game by selecting the “cloud only” option is enough to qualify for this promotion. The game must be downloaded by August 31st and only customers who have not previously downloaded the game will qualify. You should receive an email informing you of the $10 credit within a few days of downloading the game.
8/4/16 Emails informing customers that the $10 has been applied to their account are starting to roll out. I received mine early this morning. Note that the $10 credit does not appear in your digital balance. Instead, it just shows up as a promotional discount when purchase an app or game. Just buy a game with dollars, not Amazon Coins, and it will automatically use the $10 promo credit.