Sudoku puzzle game is suitable for you if you are looking to the following:
~ to play a relaxing games for passing time.
~ to brainwash.
~ to develop your logic thinking ability.
~ to exercise brain muscles.

A Sudoku puzzle is defined as a logic-based, number-placement puzzle. The objective is to fill a 9×9 grid with digits in such a way that each column, each row, and each of the nine 3×3 grids that make up the larger 9×9 grid contains all of the digits from 1 to 9. Each Sudoku puzzle begins with some cells filled in. The player uses these seed numbers as a launching point toward finding the unique solution.

No number from 1 to 9 can be repeated in any row or column。In other words, the same single integer may not appear twice in the same row, column, or any of the nine 3×3 sub regions of the 9×9 playing board.

Rule of Sudoku:
The classic Sudoku puzzle involves a grid of 81 squares. The grid is divided into nine blocks, each containing nine squares. The rules of the game are simple quite straight forward:
1. Each of the nine blocks has to contain all the numbers 1-9 within its squares. Each number can only appear once in a row, column or box.
2. The sum of all numbers in any nonet, row, or column is equal to 45.

There are two main techniques one can use to solve this Sudoku puzzle; Crosshatching and Penciling In. These two techniques are simple, straightforward, reliable, and sufficient in solving most standard Sudoku puzzles.

Crosshatching:
With this technique, a player considers a single nonet (a single 3×3 square) and attempts to fill in empty cells based on the fact that a number can only appear once in any row or column. By looking across each row and down each column, we can determine if a number can or cannot go in a cell.

Penciling In:
The is the process of writing down all possible cell candidates in the empty cells of a given nonet. Then, through crosshatching, we cross off all unqualified candidates.

Let's start playing and solving sudoku puzzle.