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 Sammy Holdings
During 1985, Sega released "Hang-On", the world's first force feedback game. Sega Enterprises was registered stock on over-the-counter (OTC) market. In 1988, Sega Listed stock on the second section of Tokyo Stock Exchange. Within this year, Sega released the Sega Mega Drive/Genesis, a 16-bit home video game platform that solidified Sega’s presence in the console market. During this year, Sega also launched the R-360, the world's first amusement arcade cabinet could rotate 360 degrees in all directions. In 1991, Sega released "Sonic the Hedgehog" as a competitor mascot to represent Sega against Nintendo’s Mario, and with 15 million copies sold, Sonic the Hedgehog spawned multiple sequels over the years and became Sega’s flagship franchise.