Download or read book Sudoku X - 200 Hard Puzzles 9x9 written by Dart Veider and published by Createspace Independent Publishing Platform. This book was released on 2018-01-17 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sudoku X also called Diagonal Sudoku. Each puzzle consists of a 9x9 grid containing given clues in various places. The object is to fill all empty squares so that the numbers 1 to 9 appear exactly once in each row, column, diagonal and 3x3 box.