The Nintendo Super Famicom was released in Japan on November 21, 1990. It was the successor to the Nintendo Famicom and was Nintendo's second home console system. It was designed by Masayuki Uemura, the maker of the original Famicom, and was an immediate success, selling 300,000 units in less than a day. As a fourth generation console, its main competition was Sega's Mega Drive (the Sega Genesis), but Nintendo quickly established itself as the leader in the home console market. Part of its success was due to the retention of several major third-party game developers, such as Capcom and Konami.
In 1991, Nintendo released a redesigned version of the Super Famicom, the Super Nintendo Entertainment System, for the North American market. The console shipped with the immensely popular game Super Mario World, and has since sold 23.35 million units.