Brain Training Puzzles: Quick Book 1: Five-A-Day for Your Brain (Vol. 1) : The six volumes of Brain-Training Puzzles make up an innovative series of six unique, color 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 easy to solve, to get your brain used to the puzzle types and to help you familiarize yourself with the quick-solving concept of brain-training. The puzzles get harder as you progress further into the book and the rest of the series.