Perfect entertainment for one, win by jumping one marble over another and removing the marble previously jumped over, thus trying to eliminate all the marbles until just one remains in the lower right corner. If you succeed, try analyzing play to win in just 18 moves! If you succeed in this, you can probably add plenty of insights to that classic puzzling page-turner "The Ins and Outs of Peg Solitaire", a painstakingly researched book whose author John Beasley clearly spent a lot of time alone. Dimensions: 5 1/2" x 5 1/2" x 1 1/6"