M4supst__bi ROM Download can be obtained free for MAME on EmuGames.net only. Play emulator game in English for the USA region. M4supst__bi is a MAME ROM that you can download to your computer or play online within your browser. You can also download roms such as The Island Of Dr. Frankenstein and SMB2 Hard Type that work on all devices including desktop and mobile. Be sure to rate the game if you enjoyed playing this ROM.