Sonic CD Cheats For Sega CD PlayStation 3 PC Xbox 360 iOS (iPhone/iPad) Android Windows Mobile - GameSpot

Get all the inside info, cheats, hacks, codes, walkthroughs for Sonic CD on GameSpot.
Sonic CD bridges the gap between his oldest adventures and his new digital exploits.

Sonic CD Videos for Sega CD - GameFAQs

Sonic the Hedgehog 2 - Wikipedia

Sonic Mania – Sonic City Sonic the Hedgehog News, Media, & Community

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Sonic CD Box Shot for Macintosh - GameFAQs

Sonic CD Box Shot for Xbox 360 - GameFAQs

Retro rings: Sonic CD hits iOS in perfect form - CNET

Sonic CD - Wikipedia

Sega bringing free 'Sonic the Hedgehog' and others to iOS/Android

Sonic the Hedgehog CD (2011)/Hidden content - Sonic Retro