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These are sample games that use the Google Play Games plugin for Unity.
Minimal is a simple sample that has an "Authenticate" button and nothing else. It is meant to show the minimal amount of code necessary to set up an integration with Google Play Games.
Cubic Pilot is a complete game that demonstrates how to use the plugin to implement sign in, achievements, leaderboards and cloud save.
Tic Tac Toe is a complete game that demonstrates how to use the plugin to implement turn-based multiplayer.
Quiz Racer is a complete game that demonstrates how to use the plugin to implement real-time multiplayer.
Note: this text assumes you have already read and are familiar with the contents of the Getting Started Guide (which is in the README.md file that exists in the root of this Github repository). Make sure to read that file first!
To build a sample, you must first configure a game project game in the Google Play Developer Console. Follow the instructions on creating a client ID for Android and/or iOS (depending on what platforms you intend to run the game). More information about this can be found in the Getting Started Guide.
For the Minimal, QuizRacer and TicTacToe samples, no achievements or leaderboards are necessary.
For the Cubic Pilot sample, you must create the necessary achievements and leaderboards for this game. To do this, open the Assets/GameLogic/GameIds.cs file and look at the achievements required by the game. Then, as you create the corresponding achievements and leaderboard in the Developer Console, and replace the "PLACEHOLDER" strings in the file by the corresponding IDs.
Go to the Android and iOS Player Settings window in Unity and configure your package name and/or Bundle ID. To access this window, click File | Build Settings..., select the appropriate platform and click the Switch Platform button, and then the Player Settings button.
Use the package name that corresponds to the Client ID you have configured in the Developer Console.
Import the Google Play Games plugin file (the GooglePlayGamesPlugin-X.YY.ZZ.unitypackage file) into Unity. Then select File | Play Games - Android Settings from the menu to set up the game for Android, and/or File | Play Games - iOS Settings to set up the game for iOS.
In each of those dialogs, enter the corresponding configuration values as set up in the Developer Console.
Follow the instructions on the Getting Started Guide to build and run the game on Android and/or iOS.
The Cubic Pilot sample uses the Jura font by Daniel Johnson, available from the Google Web Fonts project.