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Synopsis 300 Brain-twisting Puzzles is the perfect book for anyone who wants to test and challenge their mental powers. With hundreds of numbers, letters, words and visual conundrums of varying difficulty you can wrestle with problems of logic, grapple with baffling sequences and explore your lateral thinking skills. This book will entertain as much as it will exasperate and, finally, you may be astonished at how quickly you find yourself solving brain-teasers that once seemed downright impossible. Sharpen your IQ with this immense collection of visual, diagrammatic, letter and number puzzles. Each of the ten sections is composed of thirty questions to test different aspects of your IQ. It is specially designed to enable you to improve your performance as you work through it, and your rating can climb to 'exceptional' by the end of the book. With 300 fascinating and thought-provoking questions to choose from, this is a must for every puzzle fan and anyone who wants to test their IQ to the limit.