Once you weigh the stones keep putting them on the 2nd black column, once its correct the wall will open up and a code will appear. Return the golden statue to the first black column.The white line has to fall just under the scale for it to be correct The best way to figure it out is to place the idol on scale and watch where the white line falls under the scale, that’s you want to strive for.Once I placed 2 stones and the other time I placed 3 stones I can’t give you an exact number on this one because I had to do it several times and the answer was different each time.You can only place a maximum of 3 stones on the scale at a time.
The way you achieve this is placing stones and the scale and trying to figure out if their combined weight equal the weight of the golden statue. The goal here is to place stones that equal the weight of the golden statue.