Sonic 2: Aluminium Edition is a ROM hack of Sonic the Hedgehog 2 for the Sega Genesis, focusing on visual alterations. The "Aluminium Edition" suggests that the game's visual style might be redesigned with an aluminum or metallic aesthetic. The original Sonic the Hedgehog 2, developed by Sonic Team for Sega, sets the base.  The gameplay keeps the core Sonic 2 mechanics, but the visual overhaul is the primary feature. The changes are purely cosmetic and likely do not affect the game's mechanics, focusing solely on the game's visual style and atmosphere. This ROM hack is not an official Sega production, but a fan-made project.

Sonic 2: Aluminium Edition

Sonic 2 with Knuckles v1.1