Sega Superstars Tennis was developed by Sumo Digital (Virtua Tennis 3) and published by... well, it's obvious who. The game features 15 classic SEGA characters - including Sonic the Hedgehog, NiGTS, and Ulala from Space Channel 5, each with their own over-the-top tennis skills - plus some of the most unusual courts and outrageous settings ever imagined in a rousing match of tennis.