Super Duper Metal Sonic is by far the most powerful form of Metal Sonic, which is in turn a form of Sonic. Super Duper Metal Sonic is a 50 foot tall cyborg-type creature of pure Hell. With this level of upgrade, Sonic's soul is buried deep inside the metal madness. Instead, Super Duper Metal Sonic becomes a complete monster that destroys everything in sight. This is good when the only thing in sight is the Death Egg. This is bad when the only thing in sight is a city full of innocent civilians.