Sonic the Hedgehog (lost build of cancelled Amiga port of Sega

The CANCELLED Sonic 1 Port for Commodore Amiga : r/SonicTheHedgehog

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

Sonic-16 (non-existent build of unreleased Sega Genesis/Mega Drive game based on Sonic the Hedgehog animated TV series; 1993) - The Lost Media Wiki

Video Games – The Maurice Bear Times

THE Sonic Lost Media Iceberg (Over 200 Entries) : r/IcebergCharts

Final build of Sonic Xtreme found, leaking as we speak

Category:Lost Sonic, Lost Media Archive

How Many Ports of Sonic 1 (1991) Exist? - Sonic The Hedgehog Release History

Sonic X-treme - Sonic Retro

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

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