There was an undisputed king of platformers back in 1990.
Following on from the success of Super Mario Bros. and its sequels, Super Mario World had made the SNES the only console kids cared about. The Sega Genesis/Mega Drive needed a hero, a saviour who could take on Nintendo's plumbers and make the brand cool again.
That job fell to an unlikely figure - a blue hedgehog by the name of Sonic. A really, really fast hedgehog. The speed of the game blew every other platformer out of the water, with levels flying by at never before seen speeds.
In its release year of 1991, the Sega Genesis/Mega Drive outsold the SNES by two-to-one over the crucial Christmas period, thanks largely due to this blue blur.
Today, to mark the 25th of Sonic the Hedgehog, we've teamed up with AO.com to bring you 20 facts you might not know about the coolest video game mascot ever (no offence, Mario).