This is a collection of some of the finest puzzles and illusions created over the ages. This package contains 12 different puzzles. The puzzles pose an interesting challenge to your intelligence, and are an educational way to spend your leisure time. A puzzle requiring assembly of two or three pieces may initially appear very simple, but could keep you absorbed for hours. Some of the illusions are based on lesser known scientific principles, and some have a trick or twist to them. They make for very interesting and entertaining demonstrations for a gathering of two to several people.