A while ago, Sega announced that Sonic the Hedgehog 4: Episode I and Episode II were coming to the Android-based console Ouya and that Sonic CD was coming soon. Sega’s 16-bit platformer Sonic CD is now available for download on the Ouya.
Sonic CD originally came out for the Sega Mega-CD in 1993. An enhanced port of the critically acclaimed time-traveling platformer came out on a variety of platforms, including Xbox Live Arcade, PlayStation 3, iOS, Android, PC and Windows Phone.
The recently released Ouya version is based on that enhanced port which features the “Retro Engine.” The engine has widescreen graphics and the spin-dash physics from Sonic 2. This version of Sonic CD is now available for $2.99 and as every Ouya game, you can download it for free and play a trial version before you buy it.
Source: Sega Blog