MAMEAll - MAME 0.159u2 Arcade is an emulator that allows you to play classic arcade games on your Android device. This app is packed with a great collection of classic arcade games from the past.

Download and Installation:
Firstly, you need to download the MAMEAll - MAME 0.159u2 Arcade app from the Google Play Store onto your Android device. Once downloaded, tap on the app icon to launch the app. You may be prompted to download additional files or ROMs required for particular games.

Gameplay:
Once the app is loaded, you will see a list of games available to play. Tap on any game you want to play and it will start automatically. The controls are displayed on the screen and can be customized to your liking. The app also supports various controllers such as Bluetooth, USB, and Wi-Fi. You can also save and load games at any point in time.

Settings:
In the settings section, you can adjust various settings for the emulator such as graphics, sound, and input. You can also enable or disable cheats and autosave games. There are also options to change the aspect ratio and the resolution of the games.