The Mensa Number Puzzle Book: The World's Toughest Puzzles

For as long as civilizations have known how to ascribe numerical values to quantities, there have been number puzzles; ancient Egyptian scrolls have been found with difficult problems for the reader to solve. Now Mensa, the leading high IQ society, have created a book which will challenge even the most adept puzzle-solver.
A wide variety of puzzle types have been included from societies around the world in The Mensa Number Puzzle Book. Many include a historical introduction and advice on how to solve them from Mensa's top puzzle-setters.