Board Thread:Game Discussion/@comment-2405:204:B305:2C6D:401C:1632:8921:C135-20180512082142/@comment-62.210.71.205-20180513033939

Yes, you are correct. As long as you use the same sign in method for each device, you won't have any problems keeping your progress. Just make sure you don't accidentally sign in to two devices on the same acct, at the same time. That's the only thing about multiple devices that will create a problem.