Looking for an unofficial Sonic game

I remember playing one unofficial (i.e. not affiliated with Sega) Sonic game as a kid on Windows, but I can't find it any more. However, I've recovered a screenshot of it (I hope it is it).

Sonic

Anyone knows which game this screenshot is from?


The screenshot is from Ultimate Sonichaos and the game I was looking for is Legendary Sonichaos, both by Magicgrafx...