Puto's hack, "Sonic Remastered," suggests a visually enhanced and potentially gameplay-tweaked version of Sonic the Hedgehog. This likely involves graphical improvements and possibly gameplay modifications to improve the experience based on modern standards while retaining the core gameplay of the original.  This kind of ROM hack is common, aiming to modernize classic games.

Sonic the Hedgehog (USA, Europe) [Hack by Puto v1.1] (~Sonic Remastered)

Sonic the Hedgehog (USA, Europe) [Hack by JcFerggy v20080831] (~Sonic - Pixel Perfect)