Hello everyone, I have a problem I need help with. I just recently bought the graphic novel Batman Arkham Unhinged, and inside it includes a code to unlock skins for Batman Arkham city. The code was completely in intact, no one scratched it off. So when I get home and scratch off the silver part, I imput the code, and I get the message it is invalid. Would anyone happen to know why an unused code is not working?