It's one of the biggest, and best, side-scrolling old-school Sonic games ever made, but it was only available for the short-lived Sega CD, a CD-ROM add-on for the Sega Genesis (it also saw brief ...

Sonic CD and Marathon 2: Durandal have made their way to the iPhone and the iPad, more than 15 years after their original release. Sonic CD was originally released in 1993 as a game for the Sega ...