Quote Originally Posted by Solarra View Post
As to Haauke Manor, they could change the tiny keys needed for progression to 'Large keys' or something so that it's clear what's optional to pick up and what is not. I can't think of anywhere else where the key/lever etc could be used to open optional areas as well.
It doesn't work that way, though. There are a certain number of keys and you could pick up your minimum required number of keys from any of several locations along the route.