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".
Game Gear
Over 300 games were released for the Game Gear, although at the time of the console's launch, there were only six software games available. Prices for game cartridges initially ranged from $24.99 to $29.99 each. The casings were molded black plastic with a rounded front to aid in removal. Games for the system included "Sonic the Hedgehog", "The GG Shinobi", "Space Harrier", and "Land of Illusion Starring Mickey Mouse", which was considered the best game for the system by GamesRadar. Later games took advantage of the success of the Genesis, Sega's 16-bit video game console, with games released from franchises originally released on the Genesis. A large part of the Game Gear's library consists of Master System ports. Because of the landscape orientation of the Game Gear's screen and the similarities in hardware between the handheld console and the Master System, it was easy for developers to port Master System games to the Game Gear.