Puzzle Game: Classic Sudoku

Here is the of the most popular mathematical puzzles - Sudoku has a leading place among the logical games. This game is classic and standart - it saves us from loneliness, helps to improve logical thinking.
Not everybody has analytical mind... Want to quickly solve puzzles - then sudoku is for you. It has different levels of difficulty so it will be interesting for both kids and adults.
The simplest difficulty sudoku puzzles can be solved in a few minutes, but the others you can spend hours. The less cells filled, the harder the game.

The standart game field of sudoku is a square of 9×9, divided into smaller squares 3x3 boxes.
The rules are simple - you must fill the empty cells of the field with numbers from 1 to 9 so that every row, every column and every small square (3x3) and each digit should not be repeated. If you make a mistake and put the wrong number you cant sove the puzzle. The game requires attention and concentration.
There are many levels on each difficulty level.You spend free time usefully. Choose the appropriate level of the game for you - and go!