Oh, I meant credit as in continue. Basically, if you get that far without getting prompted to switch characters. I also should've phrased the other bit clearer, I meant every stage up to that point. So, if you wanted to start the stage three thread, you couldn't do so until you beat it without using a continue.
But as it is, yeah, I think that's too hard for us, as well. Beating just the stage itself in one credit is a more feasible goal.