Sonic Jr. (lost build of unreleased Sega Pico game; existence unconfirmed; 1994) - The Lost Media Wiki
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Super Sonic (lost build of cancelled Sega CD port of Sega Genesis
Sonic X-Treme (found build of unreleased SEGA Saturn platformer
Sonic the Hedgehog 2006 (lost build of Tokyo Toy Show tech demo of
Sonic the Hedgehog 2006 (lost build of Tokyo Toy Show tech demo of
Super Sonic (lost build of cancelled Sega CD port of Sega Genesis
Editing Sonic Triple Trouble (lost Master System conversion of
Super Sonic (lost build of cancelled Sega CD port of Sega Genesis
Editing Sonic the Hedgehog 4: Episode III (lost build of cancelled
Sonic the Hedgehog (lost Winter Consumer Electronics Show 1991
Editing Sonic The Hedgehog 3 & Knuckles (lost build of cancelled
Sonic & Sega All-Stars Racing (lost prototype builds of
Sonic DS (lost Nintendo DS tech demo; 2004) - The Lost Media Wiki