Yes, there's actually a bunch of Sonic games on Steam. They're easy to miss in the piles of other action games, but 2011's Sonic Generations deserves special notice for its thriving mod community.

Sonic Unleashed has been brought to PC thanks to intrepid modders. My first question was "why?" but now it's "how?" as the game doesn't exist on the PC format. it's simple: they modded Sonic ...