Pray nothing goes wrong, because if it does you are screwed. I had been playing for a while and was up to Level 24. I signed in and noticed that I wasn't signed in through Facebook, so I signed in through Facebook. It asked if I wanted Local or Server. I chose Server thinking it would sync my game. Nope! I got reset back to Level 18. I contacted support and was informed I needed my old support ID. Excuse me? How would I know that? Well, if I had taken any screenshots (I hadn't) or harassed any of my friends to join it would be there (I hadn't). Because unlike every other online game I've played you don't get a permanent player ID to track such things. Oh, and if I wanted my previous purchases restored I would have to go through Google Play Store, copy all my purchases, and submit those for reimbursement. Because, of course, they would have no record of purchases on their end. So, basically they are just doing the bare minimum so they can take your money and have no interest in actually helping you with technical glitches.