SegaSonic the Hedgehog, known by various names including Sonic Arcade, Sonic the Arcade and SEGASONIC Arcade was officially released into the Japanese arcades in June 1993. Versions of the arcade game appeared in limited quantities in arcades in anglophone countries, such as London’s Sega World.

The game was Sonic the Hedgehog’s first major arcade outing, and featured Sega’s mascot alongside two new characters: Ray The Flying Squirrel and Mighty the Armadillo. Mighty is one of the oldest characters in the Sonic franchise; he was a prototype for Sonic and thus bears an uncanny resemblance to him. Mighty would later feature in the low-profile Knuckles’ Chaotix for the Sega 32X; Ray has not appeared in any other official games, but appeared in some Archie comics. All three characters have identical controls and abilities.

More Information: http://en.wikipedia.org/wiki/SegaSonic_the_Hedgehog