Demo Boy 2 ROM Download for Nintendo (NES) on Emulator Games. Play Demo Boy 2 game that is available in the United States of America (USA) version only on this website. Demo Boy 2 is a Nintendo emulator game that you can download to your computer or play online within your browser. You can also download free ROMs such as Demon Sword, Paperboy and Clash At Demonhead as shown below. Demo Boy 2 works on all your devices in high quality.