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.
Sega Genesis
On May 22, 2006, North American company Super Fighter Team released "Beggar Prince", a game translated from a 1996 Chinese original. It was released worldwide and was the first commercial Genesis game release in North America since 1998. Super Fighter Team would later go on to release two more games for the system, "Legend of Wukong" and "Star Odyssey". In December 2010, WaterMelon, an American company, released "Pier Solar and the Great Architects", the first commercial role-playing video game specifically developed for the console since 1996, and the biggest 16-bit game ever produced at 64 Mb. "Pier Solar" is the only cartridge-based game which can optionally use the Sega CD to play an enhanced soundtrack and sound effects disc. In 2013, independent programmer Future Driver, inspired by the Disney film "Wreck-It Ralph", developed "Fix-It Felix Jr." for the Genesis.