Download or read book Variety Puzzle Books for Adults - 400 Hard Puzzles 9x9 written by Dart Veider and published by . This book was released on 2019-06-17 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 puzzle. 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.