The Super Sledge is the highest level of sledgehammer proness. It can one hit kill most enemies, and looks good too. It has moderate range, great attack, and slow attack rate. Made from Unobtanium and the Heavy Sledge Hammer.
If you have the, "Directors Cut" then the Super Sledge is only the 2nd most powerful of the Sledgehammer family. You can give the man in the Landromat more materials to upgrade the sledge even more.