Example of a traditional multiplayer leaderboard.

Leaderboards Real-Time Rankings and Gamification Solutions

Hearthstone's leaderboards are currently showing total player counts for many modes. Mercenaries has only 2638 players that have touched competitive this season; Arena a paltry 3430. Battlegrounds has over 600,000. : r/hearthstone

Solitaire Cube Review: A Legit Money-Making App or Just a Fun Mobile Game?

Tutorial: Using Memorystore for Redis as a game leaderboard, Cloud Architecture Center

How we created a real-time Leaderboard for a million Users, by Juan Manuel Villegas

Crosswords With Friends Tips to Outwit Your Opponents

Leaderboard System Design - System Design

Tap into Game Center: Leaderboards, Achievements, and Multiplayer - WWDC20 - Videos - Apple Developer

Building better leaderboards. Beyond the simple score list, by Stanislav Stankovic

Example of a traditional multiplayer leaderboard.