Keys?

I haven't been able to figure out how to unlock the last world "Magister" without having to spend the 195,000 coins. I've finished all the other worlds with three keys on each level so I thought that the last one would be available. It says my rank is Magician and I think the 300/200 means that I need a hundred more keys? But I've been replaying levels and nothing is changing.

Does anyone know how to get more keys since replaying the levels isn't working?

Sorry! I just saw that this has already been brought up in the technical issues. I guess there isn't an answer, but at least now I know I'm not the only one!