I'm not sure about this, but the toggle code might be the infamous Konami code. Since the medal name is Konami it should be it. But I haven't tried this and I can't confirm it. The Konami code is as following:
Up, Up, Down, Down, Left, Right, Left, Right, B, A
But B and A might have been replaced by A and D. But I'm not sure. Again I haven't tried anything. I haven't even tried playing Halloween mode. I just got the first medal and then I left.