Develop lateral thinking skills and improve brain power. The goal is to find a logical explanation for what appears to be an illogical situation. Do the puzzles with a friend, taking turns being puzzle setter and solver. By asking yes-or-no questions the solver attempts to find the solution within 20 minutes. One of "The Year's best puzzle books."--Games World of Puzzles. 96 pages, 5 3/8 x 8 1/4. Read Less