500 Sudoku Brain Game for Smart Minds is the best way to sharpen your grey cells. This book has been designed in four levels of difficulty-- from easy to hard. This engaging book is the perfect means to occupy oneself when getting bored or while commuting long distances. The engrossing grids not only boost your deductive reasoning but also sharpen your memory. The book has solutions at the end. The user-friendly layout of the book allows you to fill in the grids easily. - Improves attention and coordination - Enhances logical thinking - Engaging puzzles - Strengthens observation skills - An ideal gift of knowledge