Use Game Center to play with friends
Send friend requests, manage your profile, earn achievements, and compete on leaderboards across devices using Game Center.
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Apple Support
* If you see a nickname or other information already set up, you might already have a Game Center profile. To verify that you're signed in with your Apple ID on your iPhone or iPad, go to Settings and look for your Apple ID. To verify that you're signed in with your Apple ID on your Mac, choose Apple menu  > System Settings, then click Game Center and look for your Apple ID.