The Mensa Number Puzzle Book
For as long as people have been able to add up, there have been number puzzles: ancient Egyptian scrolls have been found with difficult problems for the reader to solve. Created by Mensa, the leading high IQ society, this book contains a wide variety of puzzle types from societies around the world. Each includes a historical introduction, advice on how to go about solving them, and even tips on how to create your own puzzles.
Paperback. 384 pages