Oh yeah... I forgot to tell that each time you beat story mode it gets harder, when you are unlocking the final characters, you stumble upon the terror of 6 vs 1 and 7 vs 1 matches, these are deadly, one error and the CPU destroys you.
Few tips for these matches, start by running in circles, the CPU sometimes hurt and even knock each other out, and trying to attack or defend when the enemy number is elevated is almost always a bad idea. When you manage to reduce the enemies to 3 or 4, use the hammer, as it is a fast and powerful weapon, more useful than specials and normal attacks most of the time, now you pace yourself in a hit and run strategy until you win the match.
As for game saves, I could provide mine, but I do not want to deprive anyone of the feeling of accomplishment after unlocking all secret characters.