Sonic 1 Reversed Frequencies is a fan-made ROM hack of the original Sonic the Hedgehog for the Sega Genesis. It's likely the project alters the game's music, adding new tracks or remixing existing ones with reversed audio or different frequencies. The original Sonic the Hedgehog (1991, Sega) is celebrated for its memorable soundtrack. 'Reversed Frequencies' suggests a focus on audio manipulation, providing an unconventional sonic experience. This is a product of independent development, separate from Sega.

Sonic 1 Reversed Frequencies

Sonic 1 Remade