Sudoku

Sudoku is a logic-based, combinatonial number-placement puzzle. The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 sub-grids that compose the grid (also called "boxes", "blocks", "regions", or "sub-squares") contains all of the digits from 1 to 9. The puzzle setter provides a partially completed grid, which typically has a unique solution.
If you play Sudoku everyday, you will probably notice improvement of your mind in your daily life.
I have developed this small game just for fun. and it still needs to be developed. New features will be added.
Have fun.