The solution to the Library door puzzle is in this box. Once you have all the pieces to the door, the bottom lock solution from the church donation box can be used. However, I was able to open the door without it. That should open the door. F This one is alittle hard to explain so bare with me.
Blue bridges trigger red bridges.
Yellow triggers blue. Red triggers yellow. A blue bridge starts and ends the puzzle. You have to get the green button first, then the red button, then the blue button, and then go straight to the yellow button. So, go left first to the green button, then come back and go up, before you come to the blue button, to the red button.