Add leaderboards to an app version - Configure Game Center - App Store Connect - Help - Apple Developer

Leaderboards can be added to your app version once configured. For information, view Configure leaderboards.

Everything you need to know about Game Center

Add an app to a group - Configure Game Center - App Store Connect - Help - Apple Developer

Design for Game Center - WWDC20 - Videos - Apple Developer

Unity - Manual: Configuring for Apple App Store and Mac App Store

What Was Game Center and What Happened to It?

Using Google Play Services Leaderboards in Unreal Engine Projects

Add a Leaderboard to Your iOS Apps, by Julie Elise

Add a Leaderboard to Your iOS Apps, by Julie Elise

How to use Game Center on iPhone & Mac

Bring Recurring Leaderboards to your game - WWDC21 - Videos - Apple Developer

How to Implement a GameKit Leaderboard in SwiftUI

Configure leaderboard sets - Configure Game Center - App Store Connect - Help - Apple Developer

Game Center and Leaderboards for Your iOS App

Leaderboards SpringerLink