Download or read book Circuit Board Square - Volume 1 written by Alexander Shen and published by Lulu.com. This book was released on 2018-11-02 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: 200 puzzles! Circuit Board Square is a logic-based number-placement puzzle. The objective is to fill in the 3x3 grid with all of the digits from 1 to 9. The sums from each of the paths are determined by the values in the squares connected to those paths.