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 3D Blast
"Sonic 3D Blast" was released for the Genesis in Europe on November 5, 1996, and the North American version was released on November 7, 1996. The Saturn version was released in Europe on February 13, 1997. The Genesis version was not released in Japan; only the Saturn port was, on October 14, 1999. A port of the Sega Saturn version was released for Microsoft Windows in Europe on September 11, 1997, and worldwide later that year. The game's launch coincided with the release of the similarly-titled Game Gear game "Sonic Blast", which also features pre-rendered 3D graphics.