Board Thread:Questions and Answers/@comment-26084742-20150207103648/@comment-26501002-20150207161523

You shouldn't have to, considering you are logged in to the same account. The way the App Store and Google Play store work is that once you have payed for something, there is a cloud sync for all devices, which means you can download on a different device for free. So, the answer is no, you do not need to re-purchase.

Dakota {Game Support}