Sonic the Hedgehog
The Sega Genesis had "add-on" systems that incorporated "Sonic" games. "Sonic CD", released for the Sega CD, was a 2D platform game released in 1993. The game introduced the characters Amy Rose and Metal Sonic and featured levels that differed depending upon whether Sonic was in the past, present, or future time frames. "Knuckles' Chaotix", a spin-off released in 1995 for the Sega 32X, featured Knuckles and a new group named Chaotix fighting against Dr. Robotnik. The game featured a two-player cooperative system in which the on-screen characters were connected by magic rings. There was also "Sonic Eraser", a puzzle game released exclusively on Sega Game Toshokan in 1991.
List of Sega Genesis games
This is an alphabetical list of released games for the Sega Genesis. Titles listed do not include releases for the Sega CD and Sega 32X add-ons. Included in this list are titles not licensed by Sega, including releases in Taiwan by several developers such as Gamtec, as well as releases by Accolade before being licensed following the events of "Sega v. Accolade". This list also includes titles developed by unlicensed third-party developers after the discontinuation of the Genesis, such as "Pier Solar and the Great Architects".