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 Blast
"Sonic Blast" was released worldwide in November 1996, and in Japan as part of the Kid's Gear brand on December 13, 1996, retitled "G Sonic". Worldwide, it was the last Sega-published Game Gear game; it was the system's final game outright in Japan. Though it has a similar title and was released around the same time, "Sonic Blast" and "Sonic 3D Blast" have little in common. The game is fairly common in North America, but "G Sonic" is extremely rare, costing almost 350. A port of the game was released for the Master System exclusively in Brazil in December 1997, distributed by Tectoy. The game had to be simplified to run on the Master System because of its lower graphical quality. Like "G Sonic", the Master System version of "Sonic Blast" is rare.