I'm using this on a Kindle Fire via Play store. In the last month, the app has begun crashing. It just jumps back to the kindle home screen. You can rejoin the gane, but this takes two minutes, and when it happens ten times in one game, it just ruins it. Update: developer says the version of Android on my Fire is seven years old and no longer supported. It's good they replied, but I don't like this kind of created obselescence!