Sudoku X is an addictive logic puzzle from the Sudoku series. If you are a fan of puzzles, you will definitely like this game. The rules of the game are very similar to the rules of Sudoku, but with some changes. Your goal is to fill a 9 by 9 square with numbers, but so that the following conditions are true: • Each column must have unique numbers. • Each line must have unique numbers. • In each small square (3 by 3) as well, there should only be unique numbers. • Each of the two diagonals mus