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This instructable provides step by step instructions to complete a Sudoku puzzle by simple process of elimination.

One of the things I that drove me crazy about Sudoku is how difficult it is to return to a puzzle if you get interupted. This system allows you to walk away from a puzzle at any time and return exactly where you left off.

Step 1: What you need to begin

You need:

1. A sudoku puzzle. I enlarged this one (which was the puzzle that appeared on Sudoku.com on July 8, 2006.) to make photography easier. I find this system works better on larger puzzles.

2. A pencil, Not a pen. A pencil.

3. An eraser.
<p>Method only for easy ones.</p>
<p>this is genral logic, but i want formulae for solve easily.......!!!</p>
<p>http://www.ams.org/notices/200904/rtx090400460p.pdf</p>
<p>Certainly a decent way to solve simple puzzles, but make no mistake - solving one sudoku puzzle does not mean solving them all. The above Sudoku puzzle is classified as easy; I can finish it in under a minute without even writing down possibilities.<br><br>This basic elimination method is generally the last thing you would be doing for intermediate and advanced puzzles. The hardest Sudoku puzzles require a good amount of logical thinking, observation, and occasionally memory.<br>I'd be more than happy to create an advanced puzzle for anyone interested to see if the above method can even fill up a single column, row, or box.</p>
<p>GENIUS!</p>
<p>I'm new to Sudoku. The tip about the circles, vertical and horizontal bars is a great help. Thanks!</p>
<p>Why don't you make some amazing puzzle game by yourself easily within days? and make some quick money from it.: http://goo.gl/wHB0A4</p>
<p>I solved it in 6 minutes.</p>
I appreciate all of your work, but this makes the task way more complicated now. <br>Plus, this isn't a tip for playing. Its just another kind of cheating, right?
<p>tHIS STRATEGY IS WELL USED FOR HARD SUDOKU'S . tHIS PIECE YOU GIVEN I SOLVED IT IN 10 MINUTES WITHOUT USING ANY ENCIL . AND I AM NOT A PRO EVEN . </p>
<p>tHIS STRATEGY IS WELL USED FOR HARD SUDOKU'S . tHIS PIECE YOU GIVEN I SOLVED IT IN 10 MINUTES WITHOUT USING ANY ENCIL . AND I AM NOT A PRO EVEN . </p>
<p>This is brilliant strategy, but won't it take like forever to finish ?</p>
<p>Nice but too slow - with thinking is much faster...</p><p>btw thanks 4 share</p>
<p>Guys, we just created our sudoku app...the idea behind it was that most apps in the market provide poor quality puzzles with where each puzzle has more than one solution. However, we did our homework and have tested each puzzle that was included in the game. Hope you guys like it. Please support our android app. Thanks&quot;True Sudoku&ndash;Truly one solution&quot;</p><p><a href="https://play.google.com/store/apps/details?id=com.gmail.rockingdna.staff.TrueSudoku" rel="nofollow">https://play.google.com/store/apps/details?id=com....</a></p>
Help me to answer this please. The red pen is wrong answer. Help me please. Thanks
<p>Here's the solution to your Sudoku problem. Hope this helps! =)</p>
Thank you so much for making my life easier.
<p>I think it makes more sense to go without the eraser all together. This can be done by going along each row of the puzzle and filling in all possible 1's, then doing 2's, etc. until everything has all their possibilities filled in. This way you can also insert numbers that are the only possibility in that row as you go along.</p><p>Also if you have 2 squares in a column/row/box that can only be 2 numbers (ex. 2 squares that can only be a 4 or an 8), then all other squares in that column/row/box will not be a 4 or 8, even if they have those numbers in their possibilities. If you have 3 boxes with the same 2 possibilities then you done messed up somewhere. This works for 3 or more boxes as well, but then you need 3 or more numbers exclusive within those boxes.</p><p>As for speed, practice. I can do an easy puzzle in 2 or less minutes and an extreme in less than 8 because I practiced in basically all my free time for 3 or 4 months. You get used to all the tricks and patterns.</p><p>Best of luck to y'all.</p>
<p>thanks for the advice</p>
<p>this is bloody cheap trick you mentioned above huh..</p>
<p>this is great. it made my mind explode like Chinese New Year. :)</p>
<p>There are a few simple techniques to solve Sudoku and they are:</p><p>Last Digit - <a href="http://www.livesudoku.com/en/tutorial-lastdigit.php" rel="nofollow">http://www.livesudoku.com/en/tutorial-lastdigit.ph...</a></p><p>Hidden Singles - <a href="http://www.livesudoku.com/en/tutorial-hiddensingles.php" rel="nofollow">http://www.livesudoku.com/en/tutorial-hiddensingle...</a></p><p>and Naked Singles - http://www.livesudoku.com/en/tutorial-nakedsingles.php</p><p>You also need to understand what boxes are (see image below)</p>
<p>I used dots for about a year and eventually gave it up. Not sure why anymore. I think the dots are more common in Europe. My personal challenge now is to do my solving with no jots whatsoever. I have worked my way up to the Nikoli X-treme book this way. I have to revert to jots about half the time in that book.</p>
<p>Am I the only person who uses a &quot;dot&quot; system instead of numbers? The dots are so much easier to fit into the puzzle and easy to recognize. There are 9 squares. The squares on the left are 1,4,7; middle, 2,5,8; right, 3,6,9.</p><p>I agree that Sudoku is simple logic. So many people take one look and assume it's math related -- and they give up before trying. I am addicted to Sudoku. My husband bought me a Sudoku calendar. Each puzzle is past difficult and really taxes my brain. </p><p>Does anyone have tips on how to solve the extremely challenging one? I'm feeling stupid. ;-)</p>
Sudoku is simply a logic puzzle. If it's here, it's not there. May not be the fastest way, but I average 2.5-3.5 minutes on an easy puzzle. Just start with 1, find the first 1 and look across, look down, if there are two 1's in that column or row, and only one spot to put a 1 in the remaining block do so. When no easy option presents itself move on to the 2's, and repeat. Another thing to look for is say the top left block has a 1 in the top left, the top middle block is filled except the middle row across but no 1, and the top right block middle row is empty and the bottom right square is empty. <br>You know the middle block has to be the middle row somewhere, but not where. That said you can fill in the square for the right hand block because you know the middle row is taken. <br>Last for the comment, look for rows, columns, or blocks with only 2-3 empty spaces when your stumped. You may see that it needs a 1, and a 5, but one of the spaces in a line already use the 5. So you can put the one in that spot and the 5 in the other. <br>Maybe I'll actually write up my own how too. Ya think?
<p>If anyone is lost or stuck, you can try my simple sudoku solver!</p><p><a href="http://www.simplesudokusolver.com/" rel="nofollow">http://www.simplesudokusolver.com/</a></p><p>Should be really fast and easy to use. Let me know if you have any feedback!</p>
<p>Alright its still a god technique but its not fast enough. I need a fast one</p>
<p>Alright its still a god technique but its not fast enough. I need a fast one</p>
<p>Wow! I was struggling trying to find a technique to help me with Sudoku and this was it. It was simple and straight to the point and it does work with the hard ones. The only thing wrong is that you do have to think...............TO PICKUP YOUR PENCIL AND ERASE! That is all I thought about. Try this it works</p>
<p>Nice one! You are implicit using some of the solving techniques mentioned here:</p><p>http://sudokusolvertips.com/category/sudoku-resolving-strategies/</p>
<p>aaawwwwwwesome</p>
<p>without thinking is preposterous as the &quot;solution&quot; you give is precisely what we all do when we solve &agrave; sudoku ... Exception we do it in our brain and do not write it down.</p>
<p>sorry &quot;except&quot; not &quot;exception&quot;</p><p>Difficult to write english without an french auto correct !!!! ;)</p>
What's the point in solving a sudoku without thinking? There's no pride or &quot;retribution&quot;.
Using computer programmes to solve Sodoku seems to defeat the object of trying to solve a puzzle or problem to exercise the brain! <br>Presumably 'broper's somewhat exotic spelling is not for real! <br>(who is Ible?)
this doesnt work with very hard sudoku puzzles. the really tricky ones will make you randomly pick a number for a square and check to make sure it works in that square as you fill more in.
I have done many "genius level" Sudokus without guessing. There is no need to guess. If you are interested, I'll put up the information on a wordpress blog that works for me.
Thank you. Please, do that.
I picked up my first puzzle and applied this technique. I failed then copied the puzzle again and took my time. Unfortunately the puzzle was labeled "gold" or "Hard" and I still have a few squares left with a lot needing the same numbers. Is there some sort of "next step" or should I just "hit and miss" and take the "keep trying approach"? Any suggestions?
No need to guess. If you are interested, I can provide additional clues.
Thank you. Please, do that.
whats the matter with some of you,this is the easyiest systemi have ever seen I just solved the outlaw level3 times with out a hitch,simple just fallw instructions thank you <br> <br>love this system
what to do when 1 to 9 numbers already exist in column &amp; row of particular block....
<br>man pscovio

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