Sonic the Hedgehog is a video game series created by Yuji Naka. It is published by Sega, with entries developed by Sega, Sonic Team, Dimps, SIMS Co., Ltd., BioWare, and Sumo Digital. The series debuted in 1991 with the Sega Genesis video game Sonic the Hedgehog, premiered in Japan in 1991. Most Sonic the Hedgehog games have either been platform games or released for Sega consoles and handhelds dating from the Sega Genesis to the current generation of video game consoles. However, some of the original games were ported into versions on third-party home consoles and developed by several companies. As of February 2013, the series has collectively sold over 70 million copies worldwide across both the platform games and spinoffs.