I know it has four stages, momentum based gameplay, multiple playable characters and that the person behind it are now working on its own game, Project Rascal.
Some even consider it the best 3D Sonic game. It's a pretty well know game around here. And I also hope some of you here will be able to provide some names and tell us what they think of those games. But I hope that won't deter you from trying them. I say look because, I've only played one of them and I had to stop quickly because it made me sick. So, I'll list in this thread some nice fan games that looks interesting. So, when they can't play a good Sonic game, they just decide to create their own. So, for all the Sonic fans that wants to play a new game, what could they do? Well, they could try some fans games, because even though the officials were sometimes disappointing those last years, the fans of the blue blur are still present. But I'll just say that their last reveal wasn't really well received. The world keeps spiraling down, everything keeps burning, and Sonic Team keeps disappointing.