Sad to see that Nimblebit lost interest in this game and no longer supports Googles Play Games - i.e. it is no longer possible to transport your game from one Android mobile phone to another. Nimblebit suggests to use "any file manager" to copy the files directly, but without giving instructions for which ones. So far I haven't been able to make it work. I am currently on level 40, and I have spent quite a few hours to get there. I would be sorry to see that work lost.