Contra III - The Alien Wars ROM Download for Super Nintendo (SNES) on Emulator Games. Play Contra III - The Alien Wars game that is available in the United States of America (USA) version only on this website. Contra III - The Alien Wars is a Super Nintendo emulator game that you can download to your computer or play online within your browser. You can also download free ROMs such as Contra Spirits, Gradius III and Alien Vs. Predator as shown below. Contra III - The Alien Wars works on all your devices in high quality.