**Sudoku**

I’m going to ask you straight off, ‘Do you know what Sudoku is?’ Well, as far as I’m concerned, I believe not many people in Cambodia or some Asian countries actually know or play it often. However, in the world outside, it rocks. Everyone loves Sudoku. As we are, in a way, new to Sudoku, I am given an honor to introduce this world-renowned game to you guys. First I would like to tell you a little bit about its history and origins.

*From what I’ve heard and seen on some videos, I know that the origins of Sudoku was firstly invented in the 18 ^{th} century by a Swiss mathematician, but by then it was only called Latin Square, and it wasn’t so popular as well. Later on an American magazine brought Latin Square back to life by changing them into numbers. In turn, a Japanese company took and published it in the paper, renaming it as Suuji wa dokushin ni kagiru, meaning “the digits must be single”. Unbelievably, it became an instant success and has spread worldwide. Soon afterwards, it was abbreviated to just Sudoku – ‘Su’ meaning ‘number’ and ‘doku’ as ‘single’.*

That’s it, folks! Now that you know when and how it was born, let’s go play it! Oh, one more important thing, you’ve got to know the rules of how to play it. But first of all, it is a good thing that you know about the basic explanation of it.

The big square as shown above is called the ‘Grid’. It is divided into 9 mini-grid, and each mini-grid contains 9 blocks. There are also Rows and Columns (as shown in the picture).

Now here’s the three simple rules you have to remember:

1. You have to complete the numbers from 1 to 9 in each block of each mini-grid such that there aren’t any duplicating numbers. **Eg.** If in one minigrid there is a 1, then there can’t be any more 1s in this same minigrid.

2. You have to complete the numbers from 1 to 9 in each block of each row, and the same row shall have no same numbers.

3. Just like the two said above, you have to complete the numbers from 1 to 9 in each block of each column without having two or more same numbers in the same column.

To help you understand more clearly, here’s a sample picture of a solved Sudoku:

*Sudoku: Problem*

*Sudoku: Solution*

So do you understand how to play Sudoku? One way to find out, let’s try this problem:

Sudoku is not just a game. It is very important for our brain. It helps us improve our thinking by making us think much faster, and our brain works almost like when we’re doing math. And the best part of it that makes it so popular is that you don’t need any math skills to do it at all! It bases entirely on logical thinking. Enjoy yourself!

my answer

6 2 1 3 9 4 8 5 7

3 5 8 7 1 6 4 9 2

4 7 9 8 2 5 1 3 6

2 4 6 1 5 8 3 7 9

8 9 3 4 6 7 5 2 1

5 1 7 9 3 2 6 4 8

7 6 5 2 8 3 9 1 4

1 3 4 6 7 9 2 8 5

9 8 2 5 4 1 7 6 3

Well done! You certainly is a genius.

it is really a time killing game, i appreciate it when get the very long trip.