With Game Center, you can send friend requests, manage your user profile, earn achievements, compete on leaderboards, and play with friends during a FaceTime call. You can use Game Center to access supported games across all your Apple devices.
Go to Settings app. Open their contact card, then tap Add Friend on Game Center.
In the App Store, you can invite your contacts to connect on Game Center and see your friends’ recent activity.
Go to the App Store app Use SharePlay to watch, listen, and play together.
You can report a user for cheating, an inappropriate picture or nickname, or another problem. You can also remove someone from your Friends list.
Go to Settings > Screen Time > Content & Privacy Restrictions, then turn on Content & Privacy Restrictions.
Tap App Store, Media, Web & Games, scroll down to Game Center, then set any of the following restrictions:
Multiplayer Games
Adding Friends
Connect with Friends
Screen Recording
Nearby Multiplayer
Private Messaging
Profile Privacy Changes
Avatar & Nickname Changes