Board Thread:Game Discussion/@comment-33869727-20180918201543/@comment-28412524-20180920042231

Concerning iPads: beware about GameCenter and apple account attached to it. I have iPad and iPhone both with same GameCenter AppleID without using any other social service and my devices do synchronize correctly (I am switching to play whichever device I have nearby). I would suggest to use different AppleIDs in Game Center of both devices if you want to keep them separate - AFAIK GameCenter by default uses main AppleID.

Currently GameCenter feature is a bit hidden since ios11 (or 10?) so you might need to install special app GameCenter from AppStore to be able to manage it.