Many people ask me "What's the original spelling of Soduko?"
Well, I guess it's Sudoku but the site was created as soduko.org, so let's just leave it that way and keep in mind the name Sudoku.

Copy & paste the following text into your web site's code and get a nice looking sudoku puzzle section:
<p align='center'> Sudoku puzzles courtesy of <a href='http://www.sudokushack.com/' id='sudoku_shack_link' title='Free Sudoku Games'>Sudoku Shack</a><br/> <script type='text/javascript' src='http://www.sudokushack.com/sudoku-to-go/realize.js'></script> </p>
Click here to see a Sudoku-to-go sample.

The Soduko puzzle is a Japanese logic game which entered the western world during the last decade and is gaining popularity very fast.

First, the Soduko puzzle can be anything from ridiculously easy to fiendishly difficult. Second, it's a puzzle which comprises only of numbers. digits 1 to 9 actually. no need for math knowledge, you solve the Soduko puzzle with reasoning and logic.

One simple rule:
Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9

Roll your mouse over the Soduko board on the left to reveal its solution.

You might think "I see no point in playing it ...". Well, Soduko is definitely one of the more challenging puzzles you can do, you must try one to understand :)
Soduko will require logic on your side, and will develop your logical thinking and decision making, especially in the harder Soduko boards.
Developing these logic and decision making skills can assist you in playing many other games. When you play online poker for example you have to try to determine what cards your opponents are likely to be holding. Making good decisions based on logic and deductive reasoning can be the determining factors in whether you are a winning poker player or not. Playing sudoku will help you develop these skills.

• If you understood the main, simple, idea of the Soduko puzzle, start play Soduko online, right now!
• If you're still unsure, you can take the Soduko Tutorial
• If you want to download and print Soduko boards to play by hand, do it here

• Make sure you have some free time ahead
• Resist the temptation of guess and use logic first!
• Solving time for the Soduko is typically from 10 to 30 minutes, depending on your Soduko skill and experience, so don't quit if you're Soduko-ing for 5 mins and getting nowhere

Sudoku comes in many variations. The usage of Roman numbers is one of them, and it is called Roman Sudoku.
Click here to play Roman Sudoku here at Sudoku Shack.

It could make a nice gift to a Sudoku enthusiast!

Getting tired of those plain 3 x 3 grid (81 squares) Suduko puzzles? The Independent ( A UK Newspaper ) has released a version in its weekend edition of a 4 x 4 grid (256 squares), called the Super Soduko.
Because we run out of numbers at 9, it uses the computer number base hexadecimal, which uses the letters a - f to signify 10 - 15.
So you actually needs to use the symbols 0 thru 9 and A, B, C, D, E and F.