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An obsessive collection of 1,000 challenges, puzzles, riddles, and illusions--originals as well as must-do classics. It's like popcorn for the brain with jam-packed pages and a full-color illustration for each entry, this book is a call to action. Twelve basic catagories including Geometry, Patterns, Numbers, Logic and Probability, and Perception. An easy-to-read key at the top of each game ranks its difficulty on a scale of 1 to 10, while indices in the back crossreference the puzzles. The answers are included too. 432 pages. 9 3/8 x 10 1/2 inches.