Campbell G. Brain Training Puzzles: Difficult Book 1

Carlton Books Ltd, 2008. — 180 p.Brain Training Puzzles: Difficult Book 1 is part of a series of six books designed for you to make the most of your mental potential. Each book in the series contains 150 puzzles, one per page. The puzzles increase in difficulty level as you work through, providing a constant challenge: keep your brain fit! There are many different puzzle types, ensuring a challenge for everybody, from the casual solver to the serious puzzle nut! Difficult Book 1 is filled with tough puzzle types and challenging puzzles.
The six volumes in Brain-Training Puzzles make up an innovative series of six unique, colour illustrated puzzle books. They are designed to help you make the most of your brain power by solving puzzles that increase slowly in level of difficulty.
This book contains a high concentration of puzzles that are relatively hard to solve, to give your brain a serious workout. The puzzles get harder as you progress further into the book and the rest of the series.