Company: Headcannon

In November 2006, to mark the 15th anniversary of the series, Sega released a port of Sonic the Hedgehog for the Game Boy Advance. Known as Sonic the Hedgehog Genesis, the port included some new features, but was universally panned for its glitches, poor performance, and inferior sound quality. Soon after the port's release, an independent developer named Simon "Stealth" Thomley created his own reverse-engineered demo of the game running on the GBA to prove that it could be done with superior performance. Thomley would later found the studio Headcannon, and together with Christian "Taxman" Whitehead remastered the classic Genesis/CD Sonic the Hedgehog games collected in Sonic Origins and co-developed Sonic Mania.