SUDOKU

Sudoku is a logic puzzle. played over a 9x9 grid, divided to 3x3 sub grids called blocks.

The object of Sudoku is to fill the other empty cells with numbers between 1 and 9 according to those guidelines:

- Each column must contain all of the numbers 1 through 9 and no two numbers in the same column can be the same. (Number can appear only once on each column).

- Each row must contain all of the numbers 1 through 9 and no two numbers in the same row can be the same. (Number can appear only once on each row).

- Each block must contain all of the numbers 1 through 9 and no two numbers in the same block can be the same. (Number can appear only once on each region or block)