Distributing Game Center Apps
When you’re ready to submit your app to the App Store or Mac App Store, use the Game Center section on Versions of the App Details page. There you’ll enable this version of your app to include Game Center functionality and indicate which leaderboards and achievements it will support.
Turning On Game Center for the App Version
In the app’s Game Center section on Versions, you turn on the Game Center functionality you want to apply to this version of the app.
Enable Game Center for the version.
Select leaderboards to support in this app version.
Select achievements to support in this app version.
Select which apps and versions that you want this app to be compatible with.
Enabling Game Center functionality is one part of the overall app submission process described in Submitting the App to App Review in iTunes Connect Developer Guide.
Go to the App Details page as described in Creating an iTunes Connect Record for an App in iTunes Connect Developer Guide.
In the Game Center section on Versions, click the switch to enable Game Center.
If the app uses leaderboard sets and you have leaderboards to submit with this version of your app, edit the Leaderboard Set information as follows.
In the Leaderboard Sets section, click the plus sign.
Select the plus sign to choose a leaderboard set that includes leaderboards you want to submit.
In the right pane, select the individual leaderboards from that set to submit.
If you have leaderboards to submit with this version of your app, edit the leaderboard information as follows.
If the app uses leaderboard sets and you selected your leaderboards through the sets, you can skip this step.
In the Leaderboards section, click the plus sign.
Select the leaderboards you want to submit.
If you have achievements to submit with this version of your app, edit the Achievements section as follows.
In the Achievements section, click the plus sign.
Select the achievements you want to submit.
If the app is part of a group or if you want this app to be compatible with other apps, edit the multiplayer compatibility section as follows.
In the Multiplayer Compatibility section, click the plus sign.
Choose a compatible app from the Add pop-up menu (+) (located below the list of apps).
The Add pop-up menu (+) displays the icon, name, and platform for each Game Center-enabled app you can add.
Select the versions of the app that will be compatible with the app you’re submitting.
Click "Submit for Review".
Disabling Game Center in Your App
If a version of your app was previously approved, you can no longer disable Game Center for all versions of your app. Instead, you must change Game Center properties for a new version of your app when you update it. If you disable a version of your app for Game Center, you need to change the multiplayer compatibility settings, as described in To enable a version of your app for Game Center.