New Google Play services brings Google Plus-powered friends, leaderboards, achievements to Android, iOS and web - Polygon

Google today announced Google Play game services, a first-party suite of gaming-specific services that joins similar services on other platforms, like Apple's Game Center and 's GameCircle.

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2022] Google Play Game Services #3 - Leaderboards

New Google Play services brings Google Plus-powered friends, leaderboards, achievements to Android, iOS and web - Polygon

Google Play Game Services: a quick tutorial

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Multiple App Updates Confirm Google Play Games and G+ Integration for Apps, Leaderboards, and Achievements

Archive / 2021 - Top Tech Tidbits - A Mind Vault Solutions, Ltd. Publication

New Google Play services brings Google Plus-powered friends, leaderboards, achievements to Android, iOS and web - Polygon

Which should I use for leaderboards and multiplayer matchmaking: Game Center or Google Play Games Services? - Quora