Download or read book Sudoku X - 120 Easy To Master Puzzles 9x9 - 4 written by John Collins and published by . This book was released on 2020-01-12 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: Diagonal Sudoku also called Sudoku X.The puzzle is a 9x9 grid made up of 3x3 subgrids (called "regions").Some cells already contain numbers, known as "givens".The goal is to fill in the empty cells, one number in each, so that each column, row, region and diagonal contains the numbers 1 through 9 exactly once.Each number in the solution therefore occurs only once in each of three "directions", hence the "single numbers" implied by the puzzle's name.