Sonic.EXE 3 and Knuckles

Sonic.EXE 3 and Knuckles is a fan-made game that is not affiliated with the official Sonic the Hedgehog series. It is a modification of the original Sonic 3 and Knuckles game, which was released for the Sega Genesis console in 1994. The modification includes new levels, graphics, and gameplay mechanics, as well as a new story in which the character Sonic is possessed by a demonic entity called Sonic.EXE. The game is known for its challenging gameplay and dark, horror-inspired themes, which differ significantly from the lighthearted tone of the original Sonic games.