Sonic 1 Kai is a ROM hack of the original Sonic the Hedgehog for the Sega Genesis. The term 'Kai' often implies a modified or enhanced version, suggesting this ROM hack aims to improve or change aspects of the original game. The modifications could range from simple level edits to complete overhauls of gameplay or graphics. The ROM hack was created within the Sega Genesis ROM hacking community and showcases the creativity of individuals modifying classic games. The original game, Sonic the Hedgehog, was released by Sega in 1991.

Sonic 1 Kai

Sonic 1 Hold Right to Win