Sonic The Hedgehog 3 & Knuckles (lost build of cancelled iOS port of Sega Genesis platformers; 2014) - The Lost Media Wiki

Sonic Adventure New Year's DLC (found Sonic the Hedgehog holiday-themed DLC; 1998) - The Lost Media Wiki

Spin Attack, Sonic Wiki Zone

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

Category:Lost Sonic, Lost Media Archive

Editing Sonic the Hedgehog 2006 (lost build of Tokyo Toy Show tech demo of multiplatform platformer; 2005) - The Lost Media Wiki

Video Games – The Maurice Bear Times

Sonic the Hedgehog 2 - Wikipedia

Super Sonic (lost build of cancelled Sega CD port of Sega Genesis platformer Sonic the Hedgehog 2; existence unconfirmed; 1992-1993) - The Lost Media Wiki

SegaSonic the Hedgehog (lost build of cancelled 32X port of arcade platformer; existence unconfirmed; 1994) - The Lost Media Wiki