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".
Sonic the Hedgehog (TV series)
Several video games were intended to use elements from the TV series, although only one was completed. This was "Sonic Spinball", released in 1993 for the Sega Genesis. It contained characters from the show, including Princess Sally, Bunnie Rabbot, Rotor and Muttski. The characters were also planned for use in another game, tentatively titled "Sonic-16". A prototype was created by the Sega Technical Institute. Yuji Naka disliked the project, and it was cancelled without further development. Directly afterwards, the same team worked on "Sonic Mars". Prior to cancellation, this would have featured Princess Sally and Bunnie Rabbot as playable characters.