M4sss__b ROM Download can be obtained free for MAME on EmuGames.net only. Play emulator game in English for the USA region. M4sss__b is a MAME ROM that you can download to your computer or play online within your browser. You can also download roms such as Electron User 1-4 Webwave and Super Off-Road that work on all devices including desktop and mobile. Be sure to rate the game if you enjoyed playing this ROM.