And traditional word game similar to Sudoku game, but using only the numbers 1 to 9, can overcome the language and cultural boundaries, it is called the magic box in the global era.
Sudoku does not need a crossword that language skills and cultural knowledge, even without complex mathematical abilities. Because it doesnt need adding, subtracting and dividing. Of course, you also dont look down upon it, is not so easy to be "subdued". When you start the game, when these 9 figure is likely to give you headaches, pulse rate, and infuriated.
However, when you successfully complete the full digital time, you will definitely feel ecstatic. It will let you play more and more clever.