Sonic The Hedgehog Megamix January 7, 2007 Build (S1 Hack) is a ROM hack version, specifically an 'S1 Hack', indicating a modification to the original Sonic the Hedgehog for Sega Genesis. The inclusion of a specific date, January 7, 2007, points to a particular stage of development, possibly indicating a snapshot of a work-in-progress or a specific update. It's a fan creation illustrating the evolving nature of ROM hacks and community participation. This particular version reflects a point in the history of this particular hack.

Sonic The Hedgehog Megamix January 7, 2007 Build (S1 Hack)

Sonic the hedgehog G6 v2 Final