Kratos never really had to sweat the details when came to the Underworld. Then again, he never had a chance to do away with the God of the Underworld for good. Thank the Titans for a shot at him in God of War III. Whether you need to know how to beat him or or not, remember, we take the hits, so you don't have to.
Watch the following on how to beat Hades in God of War III.