Sonic Jr. (lost build of unreleased Sega Pico game; existence unconfirmed; 1994) - The Lost Media Wiki

Sonic Jr. (Unreleased Pico Game, 1994 Existence Unconfirmed

Sonic The Hedgehog: Awakening (lost build of cancelled Sonic the

Sonic the Hedgehog 2006 (lost build of Tokyo Toy Show tech demo of

Sonic Saturn (lost build of cancelled Sega Saturn prototype of

Sonic Extreme (found prototype build of cancelled Xbox

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

Sonic Adventure New Year's DLC (found Sonic the Hedgehog holiday

Sonic the Hedgehog (lost complete build of Xbox 360/PlayStation 3

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

Shadow the Hedgehog (lost early build of platformer; 2005) - The

Editing Sonic The Hedgehog 3 & Knuckles (lost build of cancelled