release Mario & Sonic at the London 2012 Olympic Games February 14, 2012 Official website http://www.sonicthehedgehog.com/ http://www.sega.com/sonic/ http://sonic.sega.jp/ Sonic portal Sonic the Hedgehog is a best-selling video game series released by Sega starring and named after its mascot character, Sonic the Hedgehog . The series began in 1991 with the release