Use your computer, tablet or phone to download 20-em-1 and turn them into an arcade machine using the wide variety of Sega Master System emulators available on RomsDL. The free 20-em-1 game comes from the US region. It only takes a small portion of your hard disk to download 20-em-1 ROM or you can always play 20-em-1 online. This game was already downloaded by 62 people and you can be the next on the list if you simply tap on the save button.