Numerical logic puzzles are puzzles that use the numbers and the set of rules to deal with them.In this book you can find Classic Sudoku , Sudoku X Sudoku Jigsaw and Argyle Sudoku . With a great variety of number Puzzles this series is ideal for brain training and keeping your mind active. The number of puzzles in the book is 400 puzzles. This book contains easy and normal puzzles. The variety puzzle books for adult's series contain: - 100 Classic Sudoku - 100 Sudoku X - 100 Sudoku Jigsaw - 100 Argyle Sudoku - Handy 6 x 9 inch Book Layout - 2 Puzzles per Page - Ideal for Beginners In the book you will find a description and examples of solutions for each type of logical puzzles and solve all puzzles. The book is for those who like logic and math problems. Decide, developing and improving.