Sega Genesis
30.75 million first-party Genesis units were sold worldwide. In addition, Tec Toy sold an estimated three million licensed variants in Brazil, Majesco projected it would sell 1.5 million licensed variants of the system in the United States, and much smaller numbers were sold by Samsung in South Korea. By the mid-2010s, licensed third-party Genesis rereleases were still being sold by AtGames in North America and Europe. Many games have been rereleased in compilations or on online services such as the Nintendo Virtual Console, Xbox Live Arcade, PlayStation Network, and Steam. The Genesis was succeeded in 1994 by the Sega Saturn.
Sonic Adventure
During the early 1990s, Sega was one of the most successful video game companies due to its Genesis console. Sales for the console were driven by the popularity of its flagship franchise of 2D platformers, "Sonic the Hedgehog". During this time, series co-creator Yuji Naka worked with Sega Technical Institute (STI) in the United States to develop "Sonic" games. After the completion of "Sonic & Knuckles" in 1994, Naka moved to work with Sonic Team in Japan. STI began developing "Sonic X-treme" for the Sega Saturn"," which would have been the first "Sonic the Hedgehog" game to feature full 3D gameplay. "X-treme" suffered a series of setbacks and was canceled in 1997. The cancellation is an important factor in the Saturn's commercial failure; without it, the system had no original "Sonic" platformer. Meanwhile, Naka and Sonic Team developed original Saturn games, such as "Nights into Dreams." Due to the series' relative lack of presence on the Saturn, according to "Retro Gamer", "[b]y mid-1997 Sonic had essentially been shuffled into the background... it was astonishing to see that just six years after his debut, Sonic was already retro."