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
Between "Sonic Advance 2" and "Sonic Advance 3", two other Sonic games were released: "Sonic Battle", a 3D fighting game, and "Sonic Pinball Party", a pinball simulation. The last Sonic game was released for the Game Boy Advance is "Sonic The Hedgehog Genesis" on 2006, which features the original Genesis game and the 15-anniversary mode with the Spin Dash.