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

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

Editing Sonic The Hedgehog: Awakening (lost build of cancelled Sonic the Hedgehog game; existence unconfirmed; late 2000s) - The Lost Media Wiki

Sonic the Hedgehog 3 - Wikipedia

Sonic 3 & Knuckles (Video Game) - TV Tropes

Category:Lost Sonic, Lost Media Archive

Editing Sonic the Hedgehog 4: Episode III (lost build of cancelled sequel to episodic platformer; mid-2010s) - The Lost Media Wiki

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

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

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

Sonic 3D Blast - Wikipedia

ALL Sonic 3 & Knuckles Unused Content