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.

Adding Apple Game Center Leaderboards to your HTML5 game using PhoneGap

Integrating Achievements and Leaderboards into Your iOS Game Using Game Center

Leaderboards SpringerLink

Integrate Game Center Leaderboard Using Game Kit Framework in iOS 7

Game Center is getting an update! : r/ios

ios - Unable to Enable Game Center for my App - Stack Overflow

The ultimate guide to App Store Connect for app marketers

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

The ultimate guide to App Store Connect for app marketers

Game Center leaderboard and achievements not live - Unity Forum

Configure leaderboards - Configure Game Center - App Store Connect - Help - Apple Developer

Apple kills the Game Center app, but the service will continue

Apple Game Frameworks and Technologies: Build 2D Games with SpriteKit & Swift by Tammy Coron