Hi can you please tell me what is the perfect screen resolution to run a game on all mobile devices please let me know about it.
does not exist, mobile resolutions vary from device to device. And it also depends of your game. In 2D you can use the “2D Pixel Perfect Package” to avoid some difficulties with different resolutions on mobiles. Also the Unity Store have some other utilities to help us with this details… or build your own resolution manager.