As of March 2011, the series has collectively sold 89 million copies worldwide across both the platform games and spin-offs. However, some of the original games were ported into versions on third-party home consoles and developed by several companies. Most Sonic the Hedgehog games have either been platform games or released for Sega video game consoles and handheld game consoles (handhelds) dating from the Sega Genesis to the eighth generation of video game consoles (2012–present). The series debuted in 1991 with the video game, Sonic the Hedgehog, released for the Mega Drive video game console (named Sega Genesis in North America). It is published by Sega, with entries developed by Sega, Sonic Team, Dimps, SIMS Co., Ltd., BioWare, and Sumo Digital. Sonic the Hedgehog is a video game series. Mario & Sonic at the Olympic Games Tokyo 2020
