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Welcome to Sudoku Fan site

Sudoku is a Japanese number-placement puzzle game. It is a logical game and doesn't require any special calculation nor math skills, only brains and concentration is needed.

Sudoku should be solvable by entirely logical deduction and no guesses should be needed.

Playing Sudoku can be seen as brain training. If you play Sudoku daily, you will soon start to see improvements in your concentration and overall brain power.

The goal of Sudoku is to fill a 9x9 grid with numbers so that each row, column and 3x3 section contain all of the digits between 1 and 9.

Every Sudoku puzzle has one and only one correct solution.

You start with an almost empty puzzle, which has some of the cells already filled with numbers. A Sudoku should have 30 or less initial values filled. Then you fill the rest of the empty cells.

A basic Sudoku grid with plenty of givens can be completed in just a few minutes, but a more difficult variation, like High Five Sudoku, can take several hours. It depends ofcourse also on the skill of the player.

People often think that harder Sudoku puzzles are the ones with less values filled in to begin with. This is often the case, but there are plenty of frustratingly difficult puzzles available with 28 or more cells filled in.

History

The name Sudoku means solitary number and originates from Japan. The game was originally created in puzzle books and then made available in countless newspapers worldwide. Today, it's one of the most popular puzzle games of all time.

Some people attribute the game to a Swiss mathematician, Leonhard Euler in the late 1700s.

The 4 lines that create the 3x3 blocks were added later.

A similar puzzle called Number Place was published in America in the late 1970's while in 1984 a Tokyo publisher saw the Number Place puzzle started to produce a Sudoku magazine.

In the past 10 years, Sudoku has become one of the most popular online puzzle games, played by millions of people all over the globe.

There are many reasons why Sudoku has become such a popular game:

On Internet, Sudoku tournaments are being hold. The first World Championship Sudoku Tournament was held in Lucca, Italy in March of 2006.

The first World Champion came from the Czech Republic, 2nd and 3rd place went to US citizens (a Harvard University graduate student and a software engineer from Google).

The finalists had to compete by solving 45 puzzles over two days.


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