Download or read book Number Link: 250 Challenging Logic Puzzles 9x9 written by Mindful Puzzle Books and published by Number Link Collections. This book was released on 2018-09-27 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: Number Link consists of a rectangular or square grid with numbers in some cells. The goal is to connect each pair of numbers with single continuous lines. The lines must neither cross nor touch each other.