The OBB file ( .obb = Opaque Binary Blob) contains the game’s assets: textures, audio, missions, maps, etc. For on Android, you typically need:
If you already own the game on Google Play, you can legally extract your own OBB file from your purchased installation using a file manager. However, redistributing that file is illegal. The safest route is to purchase the game on the Play Store (which currently serves version 3.0 or higher) and then downgrade using an official APK archive—provided you own the license. obb gta san andreas 2.10