I don't think the medals are working. I looked for stuff with my flashlight and nothing happened. I guess it’s too specific. First, you go in the house and then go the left to get a scroll. Then you go to the right and turn the light on. The combination is white green black on top, green black white in the middle, and black white green on the bottom.
Go downward to pick up the hammer. Go as far left as you can. Go downward. Use the flashlight to get the key. Or you can just look at the walkthrough.