Sonic Jam
"Sonic Jam" is a compilation which contains the four main "Sonic the Hedgehog" games released on the Sega Genesis: "Sonic the Hedgehog", "Sonic the Hedgehog 2", "Sonic the Hedgehog 3", and "Sonic & Knuckles". Unlike future "Sonic" collections, "Sonic Jam" does not use a Genesis emulator; the games are proper ports, and all are nearly identical to the original Sega Genesis releases, with the exception of minor bug fixes. "Sonic Jam" emulates "Sonic & Knuckles" "lock-on technology"—a special feature that allows the player to merge elements of "Sonic & Knuckles" into previous games, resulting in changes to the level design as well as the choice to play as Knuckles the Echidna in "Sonic the Hedgehog 2" and Tails in "Sonic & Knuckles".
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.