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Enter the digits 1-9 into the blank spaces, Each row, column and box must contain one of each digit.
There is one restriction tough - the same digit cannot appear more then once in a row, column or a box.

About Sudoku

Even though Sudoku paper puzzles were originated in 19th century in Europe, it was the Japanese "Sudoku" that popularized the game to an audience all over the world.
The word Su is a "number" and Doku refers to the place on puzzle board where any number in the game can successfully fit in. There is no doubt that Sudoku is the perfect example of cross culture mixture and its benefits. The game is originally European American but Japanese contributed a lot to the success of this game and today, one have to say that Sudoku is enjoyed by millions all over the world.

One of the earlier derivations of Sudoku was La Siecle but the game can't be considered as an ancestor of Sudoku. This is because La Siecle used algebraic solutions to solve the puzzle and there was no mathematical logic required to play the game successfully.
The Swiss Mathematician, Leonhard Euler is said to have developed an earlier version of Sudoku as early as 18th century. In fact, Leonhard Euler modified gaming rules of some other mathematical grid games and the result was a stunning game that was quite similar to today's Sudoku. He came up with a list of rules and the concept was quite similar to "Latin Squares", a game which was famous in Europe during that period.

Leonhard Euler's game had a couple of rules and the major rule was that the grid should appear only once, across and up and down. In the late 1970's Dell Magazine started publishing a grid based puzzle game and this game is the closest relative of Sudoku that we all play these days.
Dell magazine's puzzle game was inspired from Leonhard Euler's game and the 9x9 square used in Dell's game was a direct inspiration of Euler's French version of Sudoku. However, the game was taken for a ride when Japanese puzzle game giant Nikoli came up with a version of the same for Japanese customers.

Nikoli's marketing strategies and the Japanese passion to puzzle games made Sudoku an instant hit. The game became quite popular in Japan and for every Japanese newspaper; Sudoku became an inevitable part of their papers. However, it took several more years for the game's comeback to the Western World, where the game was born.
It was only in 2004 a Western newspaper started publishing Sudoku and British Newspapers popularized the game in the whole of United Kingdom. Needless to say, this was the beginning of a strong comeback for a game which is considered as one of the most simple yet greatest puzzle games in the world. By 2005, every American newspaper had Sudoku puzzles and it became an important part along with crossword puzzles.

The international fame was revolutionizing the game play once again. The 9x9 grid stayed as the most popular variation of the game but there are many other variations of Sudoku that can be bought these days. 4X4 Sudoku and 2X2 Sudoku are the simplest forms of the game which is suggested for children because these simple forms of games can help children to learn the game quickly.
Needless to say, the simpler versions of Sudoku emerged as the best learning platforms for children and many nurseries and elementary schools included these games in their libraries. Even for adults, the game's complex variations are quite challenging and can be considered as great mental exercises. If you closely watch today's situation, Sudoku is one of the most popular puzzle games and you can't avoid the popularity of this game throughout the world. It is difficult to find a part of the world where this game is not very popular.

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