"About the original 1000 PlayThinks, Will Shortz of The New York Times said it best: �The most wide-ranging, visually appealing, entertaining, gigantic collection of brainteasers since Sam Loyd�s Cyclopedia of Puzzles almost a century ago.� Inside The Big Book of Brain Games, you will find an obsessive collection of 1,000 challenges, puzzles, riddles, illusions�originals as well as must-do classics�it�s like salted peanuts for the brain. With jampacked pages and a full-color illustration for each entry, the book, opened anywhere, is a call to action. (And it�s guaranteed to make you smarter.) Twelve basic categories include 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 cross-reference the puzzles. (You�ll find the answers back there, too.)"