One of the features that skyrocketed Facebook's success was it's online games and Google didn't take too long to add this feature.
You can access the Google+ Games by clicking the new games button which will lead you to the games area. You can see the games which are available along with their statistics.Unlike Facebook Google+ has separated your gaming from your social feeds and you will not be distracted by the game feeds. So if you are not interested in gaming, just ignore it.
Google has some popular titles like Angry Birds and Zynga Poker and promise to bring some high quality game titles from a narrow range of partners they have chosen to work with.