A Sudoku consist of a 9 x 9 grid, which is split into nine regions with 3 x 3 fields.The objective is to fill the grid with the numbers from 1 to 9. Every number has to be once in each row, once in each column and once in each region of the grid. You get a partially filled grid, wich has only one unique solution.
It is game logic. Very Good For Intelligent. Play it every day will help you have a good memory, Have luck to you.