Mega Man 4 ROM Download for Nintendo (NES) on Emulator Games. Play Mega Man 4 game that is available in the United States of America (USA) version only on this website. Mega Man 4 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 Mega Man, Mega Man 2 and Mega Man 3 as shown below. Mega Man 4 works on all your devices in high quality.