Dimensions 3.5″ sq.
An extremely challenging puzzle. Object: To ÌÓunlock,ÌÒ open, and remove the penny. There are four internal dowels (sticks) that must be moved into an ÌÕunlocked position.ÌÒ Then, deciding where the key, short dowel is and rotating it to flat side upÌäall this while being unable to see what you have done or even if youÌ¥ve done it! ItÌ¥s a doozy! Not for the faint of heart. (Ten pieces)