I looked everywhere on Youtube and could find anything like this, so I'm going to assume this hasn't been done before.
Anyways, I originally made this just to replace one of the songs in Sonic Generations, mainly because I was bored at the time. I figured that I might as well release it here as it is still a mash-up.
E.G.G.M.A.N from Sonic Adventure 2 with the Doc Robeatnix remix from Shadow the Hedgehog
