Status Brightness is a free application that allows you to change the screen brightness of your Android device without having to exit the current application. It's very easy to use and allows you to change the brightness of your screen at any time, even while you're in a game or while using another application.

To use it, just install the app and open it. You will see an icon in the status bar notification area. Click it to start using it. You will be asked to make a selection. After making a selection, you will be returned to the place where you were previously working.