A box. Blue. Aluminum. ...and it has a nut on top. Looks simple, eh? But we know this puzzle is by master puzzle designer Wil Strijbos, so it is anything but. Beautifully constructed from anodized aluminum, this is a treasure in itself. The goal is make this box happy. Happy? What? How can a box show any feelings? But, when you turn it over and peer into its depths from the bottom, you will see a sad little face staring back at you. Just like a Yin/Yang sign, the face is on a cylindrical "neck" with two ends. The opposite face is smiling. Your goal is to free the "face" and then reassemble it so that it now smiles at all who can see it. Just make the box happy. Happy puzzling!