Conventional wisdom states that the 16-bit battle between Nintendo and SEGA ended in a draw, but final figures of the generation indicate otherwise. The Super Nintendo sold approximately 20 million more systems than the Genesis, which was discontinued with over 29 million in sales. The reason why so many consider the Genesis and SNES on equal footing is due primarily to the success of Sonic the Hedgehog and the early victories of SEGA's 16-bit hardware, such as the lampooning of Nintendo in a series of clever ads. However, the causes of SEGA's lead ultimately turning into a deficit are legion. One could finger the excellent late-generation releases of Donkey Kong Country and Super Mario World 2: Yoshi's Island.
But IGN believes that it is the device that celebrates an anniversary today that pushed the Genesis into its slow spiral. On October 15, 1992, SEGA released the SEGA CD add-on for the Genesis in America.