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The rules of the Sudoku

In Order to solve a sudoku puzzle you have to learn the rules first. Don't be afraid! These rules are very easy.

To reach the goal of this game you have to enter digits from 1 to 9 into the 9×9–sudoku. If you filled all small boxes you have solved the puzzle.

The standard sudoku has exactly three rules that must be fulfilled when you enter the digits:

• Rule 1
  

  Every row contains every digit exactly once.

• Rule 2
  

  Every column contains every digit exactly once.

• Rule 3
  

  Every box contains every digit exactly once.

Now you have learned the rules of the game and you can already solve your first puzzle. Have fun.