Sonic 2 Recreation Part One indicates a ROM hack that aims to recreate or faithfully reproduce Sonic the Hedgehog 2. The 'Part One' suggests this is a work in progress, potentially hinting that the project aims for a complete recreation of the original game or at least a significant portion.  This ROM hack is a fan project and not related to Sega's official development.

Sonic 2 Recreation Part One

Sonic 2 Migthy The Armadillo