Nathan Haselbauer, President of the International High IQ Society, has painstakingly researched and designed this impressively varied collection of over 500 mind-bending puzzles to enable you to determine just how clever you are.

This huge variety of maths, logic and word puzzles ranges from reasonably straightforward to fiendishly difficult. Each puzzle is clearly presented, though, and its solution is perfectly clear. In theory, each puzzle can be solved - in your head - in just a few minutes.

Fully endorsed by the International High IQ Society, the fastest growing high IQ society in the world, this book represents the gold standard of IQ testing.

Praise for Nathan Haselbauer:

'The young New Yorker who's challenging the Old Guard of the IQ World' Observer