This book is for those who enjoy casual MathDoku puzzles, or for those new to MathDoku. MathDoku has been proven to improve memory, concentration, and other mental skills. It is great for helping children and adults improve their math and pattern recognition skills, while keeping the mind quiet and reducing stress. MathDoku is incredibly fun and addictive. All puzzles were carefully and individually crafted with the highest standards, and none of the puzzles or their components were computer generated.