The game starts but shows a black screen indefinitely.
This serves as the installer, containing the game's core programming code, user interface scripts, and basic system instructions. It is usually relatively small (under 15 MB).
In simple terms, the (Opaque Binary Blob) file is the game’s data package for Android. It contains nearly all of the assets that make Vice City what it is: mission scripts, 3D models, vehicle textures, character skins, environment maps, sound effects, and the licensed 80s soundtrack. Without the OBB file, the APK (the actual game application) would be a mere shell – you would see only a black screen or an immediate crash.