Idea:
A bonus level in a Sonic game -maybe like a SXS Generations add-on or just something if Sonic Heroes were to be remade. It has absolutely nothing to do with the story and is there for nothing but sheer joy and chaos. You are in a large area with many, many breakable items, and the goal is to destroy as much as you can as fast as possible. BUT!
You get to play as Omega.