Ecco The Dolphin ROM Download for Sega Master System (Sega Master) on Emulator Games. Play Ecco The Dolphin game that is available in the United States of America (USA) version only on this website. Ecco The Dolphin 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 ECCO, ECCO - The Tides Of Time and ECCO Jr. (UJE) (Mar 1995) as shown below. Ecco The Dolphin works on all your devices in high quality.