board, with a Motorola 68000 processor and a Zilog Z80 sound controller chip. In Japan, the Mega Drive fared poorly against its two main competitors, Nintendo's Super Nintendo Entertainment System and NEC's PC Engine. The Genesis achieved considerable success in North America, Brazil, and Europe, thanks to its library of arcade game ports, the popularity of Sega's Sonic the Hedgehog series, several popular sports franchises, and aggressive youth marketing. It was succeeded in 1994 by the Sega Saturn. More than 30 million first-party Genesis units were sold worldwide.