This puzzle collection features five hundred new IQ puzzles. Formulated in association with the International High IQ Society and covering a broad spectrum, the puzzles range from surprisingly easy to a level of difficulty that will challenge even the sharpest minds. The puzzles vary from math and logic problems to word games, with the emphasis throughout on clarity of presentation and elegance of answer.
 

Over 200 brainteasers that take two minutes or less. These original brainteasers offer a wide range of very innovative and highly challenging puzzles.
 

What's Your IQ? is a complete guide to the hidden powers of the mind. More than a dozen self-scoring tests take you through the ins and outs of human potential. Build on your existing skills and discover skills you didn't know you had.

Complete with informative discussions of how each category of intelligence is calculated, and the effects different aptitudes have on your life, What's Your IQ? is the only book on intelligence testing you need.

 

The Everything Test Your IQ Book will test your IQ and improve your thinking and problem-solving skills. Featuring ten different IQ tests, from logic and verbal to extremely difficult, you're sure to find a challenge.

Here's the biggest and most exciting book of sudoku puzzles ever compiled. Over 400 new puzzles designed to satisfy all levels from beginner to expert are featured, with all kinds of challenges, all levels of difficulty, and more varieties of number-placement (and letter-placement) puzzles than any other collection available.