Yes. Android TV supports single-player and multiplayer gaming. It gives different options like playing online games and offline.
You do not need to close applications on Android Operating Systems the same way you do on a desktop Operating System. The Operating System is a self-management tool.
This is easy. Open Google Play Store head on the listing. Find an app that you need and select Install. However, Android TV Boxes come with a set version of the Google Play Store.
Like any other OS. Android TV OS update will pop up a message when an update is available. Using that message/direct link, you’ll update your system. But, in case you miss that message accidentally.