Plot: Sonic the Hedgehog 2 is a 1992 platform game developed and published by Sega for the Sega Genesis/Mega Drive console. It is the second main entry in the Sonic the Hedgehog series and introduced Sonic's sidekick, Miles Tails Prower. Wikipedia
Plot: Sonic Mega Collection is a video game compilation developed by Sonic Team and published by Sega in 2002 for the GameCube. The compilation contains twelve to fourteen games originally released on the Sega Genesis. Wikipedia
Plot: Sonic Compilation is a video game compilation released for the Sega Mega Drive containing three previously released Sonic titles: Sonic the Hedgehog, Sonic the Hedgehog 2, and Dr. Robotnik's Mean Bean Machine.
Plot: Sega Classics Arcade Collection is the name of two compilations released for the Sega CD. Despite their titles, both versions of Sega Classics Arcade Collection include only the Sega Genesis ports of all the games included. Wikipedia
Plot: Sega Genesis Collection is a compilation of video games developed by Digital Eclipse and published by Sega for PlayStation 2 and PlayStation Portable. Wikipedia
Plot: Sonic Gems Collection is a 2005 compilation of Sega video games, primarily those in the Sonic the Hedgehog series. The emulated games span multiple genres and consoles from the Sega Genesis to the Sega Saturn and retain the features and errors of their initial releases with minimal edits. Wikipedia