If you're the real gamer type the word
OBB (opaque binary blob) shouldn't be new nor sound strange to you as the latest and the best in the world of
android gaming makes use of the OBB data file to run and many game making companies are following the trend. This
OBB is not an app with the file extension .apk. See OBB as a data file linking to the app the developer made it for. Its very simple and no real trick or much steps involved before you get your game running with the OBB file. So this tutorial would be based on installing your OBB data file to work alongside with the apk.

see full details here www.http://naijabrainies..is/2017/06/how-to-install-apk-with-obb-file-on.html