Variety Puzzle Books for Adults - 400 Hard to Master Puzzles 9x9

Numerical logic puzzles are puzzles that use the numbers and the set of rules to deal with them.In this book you can find Straights, Numbricks, Suguru and Calcudoku .
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 hard and master puzzles.

The variety puzzle books for adult's series contain:
- 100 Straights
- 100 Numbricks
- 100 Suguru
- 100 Calcudoku
- Handy 6 x 9 inch Book Layout
- 2 Puzzles per Page
- Ideal for Experts

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.