Sonic the Hedgehog (2006 game)/Development - Sonic Retro

Sonic Riders (lost build of cancelled Game Boy Advance port of racing game; 2006) - The Lost Media Wiki

Prerelease:Sonic the Hedgehog (2006) - The Cutting Room Floor

SEGA Talk Podcast: Sonic the Hedgehog (2006) - Sonic Retro

Sonic the Hedgehog (lost Winter Consumer Electronics Show 1991 demo build of Sega Genesis/Mega Drive platformer; 1991) - The Lost Media Wiki

Every Sonic The Hedgehog game ever and in what order to play them - Meristation

Opinion – Nine Sonic Games I'd Rather Sega Make Than Another Sonic Boom - Game Informer

The Case For Sonic Unleashed (Xbox 360/ PS3) – Source Gaming

Screw This Game - Sonic Origins Modder Halts Development On Massive Patch

Sega can save Sonic the Hedgehog – here's how, Sonic the Hedgehog

Sonic the Hedgehog CD (Video Game) - TV Tropes

One fan's struggle to fix the worst game in Sonic history

Prerelease:Sonic the Hedgehog (2006) - The Cutting Room Floor