MAME4droid (0.139u1) is an Android emulator designed to run classic arcade games using the Multiple Arcade Machine Emulator (MAME) core. Based on MAME 0.139u1, this version supports thousands of arcade titles from the golden era of gaming. It allows users to play vintage games with touch controls, external gamepads, or Bluetooth controllers for an authentic arcade experience. The emulator includes customizable settings such as screen filters, different aspect ratios, and button configurations to enhance gameplay. It also offers features like save states, high scores, and support for various ROM sets. Performance varies depending on device hardware, with older games running smoothly while more demanding titles may require powerful processors. MAME4droid (0.139u1) is ideal for retro gaming enthusiasts who want to relive arcade classics on their mobile devices. While it does not include ROMs, users can load their legally obtained game files to enjoy the nostalgia of classic arcades.