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
"Sonic Colors", released in November 2010, expanded further on the "Rush" series gameplay with the addition of the use of "Wisps", which gave Sonic various new power-ups and gimmicks. "Sonic Free Riders" was released in November 2010 as a follow-up to the "Sonic Riders" series, and was developed exclusively for Xbox 360's Kinect system. Later on, "Sega Superstars Tennis" for the Wii, Xbox 360, PlayStation 3, PlayStation 2 and Nintendo DS was released in 2008 and "Sonic & Sega All-Stars Racing" for the Wii, Xbox 360, PlayStation 3, Nintendo DS and PC and iOS was released in 2010, followed by a sequel in 2012.