In the dimly lit chamber of the Professor Punsley's Think Tank, I, Professor Punsley, shall reveal to you the ancient technique of Sword in the Wall. It's a puzzle so old, so enigmatic, that even I, Professor Punsley, have forgotten what it's used for. But, with a few quick calculations and some well-timed puns, you shall be the master of the Sword in the Wall!
Locate the wall. Any wall will do. The wall of the castle, the wall of the fridge, the wall of the bathroom... The point is, you get the idea, right? Learn more about finding the wall.