Originally Posted by Unregistered
On the third floor there are four green box like things. Each one is for a different position of the symbols. There is a gold arrow above and below one of the four. That is the one you can change using that box. Simply click on the arrows until you get to the symbol you want. Then do the same at each of the four boxes. The symbols need to match the top row of symbols on the door in order to open the door. You will hear a clinging of chains if you get all four correct. I would suggest writing down each door and its symbols as you will have to go to some of them more than once.
I'm having trouble with this too... It will not let me do any interacting with the green boxes. Should there be an ! or X over top of the green boxes? I'm completely stuck...