Watch HDToday. 30 years ago, on June 23rd, 1991, Sonic the Hedgehog was released on the SEGA Genesis, beginning a new era of gaming. Since then, Sonic has been running through countless zones, beating badniks, and saving the world with the help of his friends. This performance is to thank you, all of you, for being there every step of the way, and to remind us all of the amazing journey we've been on. Happy 30th Anniversary, Sonic!