Sonic 1 Mania Edition is a ROM hack of Sonic the Hedgehog for the Sega Genesis, likely inspired by or emulating elements from Sonic Mania. It probably incorporates updated graphics, level design reminiscent of Sonic Mania, and potentially enhanced gameplay mechanics.  The creator(s) are likely part of the Sega Genesis ROM hacking community, inspired by Sega's official Sonic Mania release.  The original game, Sonic the Hedgehog, is a landmark platformer by Sonic Team and Sega.

Sonic 1 Mania Edition

Sonic 1 Kai