Google Play game services lets you add great social features to your games quickly, without having to build them yourself. You can add multiplayer, game invites, quests, and a variety of other features — all from within your app. Google provides cross-platform game and player infrastructure for you, as well as insights and analytics to help you understand the activities of users in your games.
The case study presentations below highlight how top game studios are taking advantage of Google Play game services — the features they've added and the results they are seeing. Each deck (PDF) is focused on a single game and how it uses a specific Google Play gemes feature.