com.google.android.gms.games	Contains the games client class.
com.google.android.gms.games.achievement	Contains classes for loading and updating achievements.
com.google.android.gms.games.event
com.google.android.gms.games.leaderboard	Contains data classes for leaderboards.
com.google.android.gms.games.snapshot	Contains data classes for snapshot functionality.
com.google.android.gms.games.stats