you can solve the combination without figuring out the logic (which makes no sense to me)... because it says 1,2,3,4 and then the clues say the same thing, the plaques say the same thing and yet, the combination is 1,3,2,4 and i don't get it however. with the hatch, when you put each digitt in, if it is correct, it says "it clicks" , if it doesn't click, you have to start over. so you can do like ...try 4, it doesn't click, okay, start over, try 1, it clicks, then 2, doesnt click, okay start over, try 1, click, 3, click, 2 click. basically just listen for the clicks. then the second time around with the buttons behind the paintings, if you push the right button, your character remarks "i hear machinery turning" and if you do it wrong, your character remarks "i must not be doing it right"