Sonic Jr. (lost build of unreleased Sega Pico game; existence

Editing Sonic the Hedgehog (lost Tokyo Toy Show prototype build of

Nintendo vs. Sega: The battle over being cool - Polygon

Sega just downscaled the pre-rendered cutscenes from Wii U in

Sonic Runners (found endless runner mobile game; 2015) - The Lost Media Wiki

PICO] A look at Sonic the Hedgehog's Gameworld localization

Super Sonic (lost build of cancelled Sega CD port of Sega Genesis

Had Sega Not Dropped Out - Video Games - Sonic Stadium

Sonic the Hedgehog (lost build of cancelled Amiga port of Sega Genesis platformer; 1992) - The Lost Media Wiki

Sonic Boom 2013 (lost livestream of Sonic the Hedgehog convention; 2013) - The Lost Media Wiki

Sister Sonic (lost build of cancelled Sonic the Hedgehog localization of Popful Mail Sega CD side-scrolling platformer; 1993) - The Lost Media Wiki

Sonic Jr. (Unreleased Pico Game, 1994 Existence Unconfirmed

circuit, Highway Forever

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

Sonic Unused Content/Prototype Digging General, Page 2