John NESS is a high-quality multi-emulator for Android 6.0+ developed by John Emulators. This arcade game emulator app requires game files to work. The app has an original engine that provides a smooth gaming experience and high-quality rendering. It is compatible with Android 9.0 and has a fully customizable layout that allows you to customize the keys and turbo buttons.

One of the best features of John NESS is that it allows you to search for game files in SDCard and Internal Storage. You can also use zipped files, save states, and take screenshots. The app also supports fast forward/slow down (x0.25 - x16) and Bluetooth/MOGA controller. Additionally, if you want to use Dropbox, you will need to have John DataSync installed.

Please note that to remove ads, you will need to purchase "remove ads." Overall, John NESS is a great arcade emulator app that provides an excellent gaming experience.