As we can read on Wikipedia, Sonic Mega Collection is a sonic-games compilation for the Nintendo GameCube and Playstation 2. The compilation contains twelve to fourteen games depending on the region, all originally released on the Sega Mega Drive / Genesis console. Ten of the included games are installments of the Sonic the Hedgehog series, while the remaining two to four games are only related to the series by company. Sonic CD and Sonic Drift were also planned to be included in the beta version, but the former was deferred to Sonic Gems Collection and the latter appeared in Sonic Mega Collection Plus. Below you can see is an extremely old video of Sonic Mega Collection with all the originally planned games.
Post by Mariosegafreak