"The game focuses on the events of a dimensional merge between multiple worlds after a confrontation between Sonic and his friends against Dr. Eggman and Eggman Nega and how they must find the chaos emeralds to fix whatever is happening to their world before time runs out."
As you can see, this is heavily inspired by Sonic Rush's plot. It was simple, interesting and reasons as to why we can have characters from Archie, Underground, & AoSTH.
Now for the characters... I'm not gonna lie, I did go a little overboard with the roster and I may be biting off a lot more than I can chew but what's the point of making a game if you're not gonna put all of your wants and needs into it?
For the playable characters, we have...
- - Sonic the Hedgehog