Zillion II - The Tri Formation ROM Download for Sega Master System (Sega Master) on Emulator Games. Play Zillion II - The Tri Formation game that is available in the United States of America (USA) version only on this website. Zillion II - The Tri Formation is a Sega Master System emulator game that you can download to your computer or play online within your browser. You can also download free ROMs such as Zillion, Wonder Boy III - The Dragon's Trap and Alex Kidd - BMX Trial as shown below. Zillion II - The Tri Formation works on all your devices in high quality.