Here’s how to how to solve the mural light puzzle in Nancy Drew: Mystery of the Seven Keys.
Once you use the snow globe to unlock the mural, you can try to solve the light puzzle. Light is coming from the upper left corner of the mural. There are several refractors below that you can pick up with your left mouse click. When holding one, you can right-mouse click to rotate it.
Place the refactors on the pegs (you don’t need to use all pegs, but you will need to use all refractors). The goal is to light up the mural, even though there are squares elevated that block light.
Here’s the full solution:
You’ll know it is solved when Nancy gasps and a secret door opens nearby.
Here’s the full video walkthrough:
