OS X Mountain Lion: Set limits on Game Center
You can use parental controls to control whether a user can add friends or play multiplayer games in Game Center.
To set Game Center limits for a user, you must first turn on parental controls for the user.
- Choose Apple menu > System Preferences, and then click Parental Controls.
- If the lock is locked, click it and enter an administrator name and password.
- Select the user you want to control, click People, and then select the Game Center activities you want to allow.
To let the user participate in multiplayer games, turn on “Allow joining Game Center multiplayer games.”
To let the user send and receive friend requests, turn on “Allow adding Game Center friends.”