Okay, so I beat all four stories, completed all challenges, and I collected all the cards. Is there anything else? I remember reading on another website that they said that you can unlock super sonic, super shadow, tikal and metal sonic second form (sonic heroes style) by completing all the challenges with sonic for super sonic,shadow for super shadow, metal sonic for metal sonic version 2 and complete colloseum highway with knuckles for tikal. Is this true? It would be cool if you can use them. Please help me.