# Explanations Sudoku

## Sudoku

Sudoku is a puzzle consisting of a 9 x 9 squares Some numbers are given, the other to be completed.

Each line (blue) number of 1,9 to be entered. In each column (green) and in each field (orange) as well.

**Example:**

In the blue line number 9 was introduced, and only the number 6 can be filled.

The column must be completed only one number, ie 8.

It may be completed in the field, remains 1 and 7.

In the column where 9, 5 and 1 are filled no more than once.

It can not be filled with 7 and 1 in the second window.

This was just one example of sudoku puzzles on the site are more complex.

## A few methods

Sudoku can be solved in different ways.

Go to page Methods for solving Sudoku, to learn about the different methods.

## Filling page

When you click the box with the mouse, you can enter a number from the keyboard.

If you need help, you can click on the menu ** hint**.

If you do not have a choice, you can click

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*Help me!*If you want to see the solution, click

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*solution*## Too easy?!

In the left menu you can set the difficulty level.

There are levels from ** Beginner** to

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*Expert*