(Prompted by this question.)
Games are big on Android. They're a huge category on the Play Store, and the Play Store app shows Games at the same level as Apps (as well as Movies & TV, Music, Books, and Magazines).
There have been very few games questions asked here, and the vast majority of those have been about trying to get a game to run on a particular device or to save/export the save-game data to reload after a factory reset or onto another device. (And, frankly, a good bunch of mis-tagged questions that are only about "games" insofar as the app the person is trying to work with happens to be a game, but I digress.)
However, our help center makes no mention of games and questions about gameplay, either that they are or are not on-topic. I think we should rectify that.