I drove myself nuts with those stupid rocks and then realized that once you have an amount on the scale that looks to be right, click on the rocks on the scale and they become one pile and then you put that pile on the other stand across from the stand that the idol is on. I kept waiting for something to tell me that I had picked the right rocks. It doesn't do that. As soon as you think that you have the right rocks just click on the rocks on the scale and move them to the stand, then the wall will open up and you the dictionary with the code you will need on it.