The game is played with numbers but it has nothing to do with mathematics.

Numbers from 1 to 9 are inserted into sets that have 9x9=81 squares in total. Each number can be used only once in a column and a row. Each number can be used only once in the blocks of 3x3=9 square blocks.

To solve the puzzle, you need to fill in the table so that every row, column and block of squares, each consisting of 9 entries, include all numbers from 1 to 9, no number is replicated or omitted. Some numbers will already be inserted in the puzzle. The higher number of pre-inserted squares indicates a lower level of difficulty. Solving a Sudoku puzzle can take, depending on the difficulty level, between 20 minutes and 2 hours and sometime ever more if it's very very difficult.

The game is played with numbers but it has nothing to do with mathematics. It does not require any knowledge of addition or multiplication. The came is composed of nine squares from left to right and top to down, which, in turn, are divided into nine squares again.

The player inserts numbers from 1 to 9 into these squares. Sudoku is a Japanese-style crossword solved with numbers instead of words. Clues are offered in accordance with the difficulty level of the puzzle. Every square is divided in itself and there can be only one of each number in each column, row and small square.

Sudoku experts say that the game is simply played by reasoning, which is the reason why the Sudoku craze that broke out in Europe last year has now spread out to the United States and the number of players rises every day. Sudoku is an intellectual numerical puzzle that enhances the IQ. It is a game that you can play on the bus, on the train or during your lunch break.