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•  The name Sudoku is Japanese, meaning single numbers.
•  But the game is believed to be an American invention, created by a man named Howard Garns.
•  The earliest known examples of the game were published in 1979.
•  In the 1980s, the game appeared in Japan under the name Sudoku.
•  In recent years, newspapers in Britain began publishing the game.
•  And last year, its popularity spread back to the United States.
•  Now the games are found in several major American newspapers, in bookstores, and on the Internet.
•  You can even play Sudoku on cellular telephones.
•  Sudoku is designed to be played by one person.
•  The rules of the game are simple, although completing it can be extremely difficult, especially higher-level Sudoku games.
•  Although the game uses numbers, you do not have to be good at mathematics to complete Sudoku successfully.
•  Anyone who can count can solve Sudoku.
•  The game includes a box that contains 81 spaces, or smaller boxes.
•  The goal is to fill in each space with a number, one through nine.
•  Some of the spaces are already filled in so the player must complete the rest.
•  The numbers must be placed in such a way that each number is represented in every line of spaces, going across the box, and up and down.
•  Nine areas within the main box must also contain each number, one through nine.
•  A single mistake in Sudoku makes the whole game wrong.
•  The games are rated, depending on their level of difficulty.
•  Numbers have been called an international language because they are the same in any language.
•  Sudoku is a good example of this international language of numbers that anyone, in any country, can understand.
•  Sudoku books are currently among the top sellers in the United States.