Sudoku - Recently Updated Pageshttp://sudoku.wetpaint.com/pageSearch/updatedRecently Updated Pages on http://sudoku.wetpaint.comen-usinfo@wetpaint.comTue, 10 Jun 2008 08:31:06 CDTTue, 10 Jun 2008 08:31:06 CDTwetpaint.com60Sudokuhttp://image.wetpaint.com/wiki/logo/image/1Cb23bXwa7GhybZUmpk56TA==16630http://sudoku.wetpaint.comSudoku: Sudoku wiki, Learn about Soduko, Solve Sodoku Puzzles, Share Soduku Secrets. A site about the sudoku puzzle—get free sudoku solving advice and tips for where to find daily sudoku puzzles. Gameshttp://sudoku.wetpaint.com/page/Gamesamelia28http://sudoku.wetpaint.com/page/GamesTue, 10 Jun 2008 08:31:06 CDT
]]>Hobbyhttp://sudoku.wetpaint.com/page/HobbyAnonymoushttp://sudoku.wetpaint.com/page/HobbyTue, 10 Jun 2008 05:21:08 CDT This is a smashing game....practice your startegy Use this template when you want to use photos and text to tell your story. Click EasyEdit, then highlight this text with your cursor and type over it with your own words: You can write as much as you want!

This sample photo is easy to replace with one of your own: Click the EasyEdit button, highlight the placeholder image at left and hit "delete." Then click the "image" button in the toolbar and use the "browse" button to find the image you want to insert from your computer. It's that easy.

The text can be wrapped around your image, or you can have the text start below the photo. You can also move the photo to the right side of the page. See your choices for photo and text placement by clickin on the photo with your mouse and then clicking "image" on the toolbar.

You can also change the size of your photo by clicking on it once to highlight it, then by clicking the "plus" or "minus" sign in the "Edit Image" toolbox. When you're all done, save your page.

]]>Hobby Sitehttp://sudoku.wetpaint.com/page/Hobby+SiteAnonymoushttp://sudoku.wetpaint.com/page/Hobby+SiteTue, 10 Jun 2008 04:59:51 CDT

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]]>Sources for Puzzleshttp://sudoku.wetpaint.com/page/Sources+for+PuzzlesAnonymoushttp://sudoku.wetpaint.com/page/Sources+for+PuzzlesAdded new linkFri, 23 May 2008 13:52:28 CDT

Where do you get your sudoku fix?数独


Click EasyEdit to add your favorite sources (newspapers, books, websites, clubs, or contests) below.

Newspapers


Hundreds of newspapers publish sudoku, including the following. When offered, the links go to the puzzle page; otherwise, to the newspaper's home page.



Don't see your paper here? Click EasyEdit to add it to the list below.



Books


Sudoku sections have mushroomed at booksellers since 2005, featuring titles from the following. Be sure to add your recommendations, too.

Click EasyEdit to add your own recommendations to the list below.

Sudoku for Dummies

Sudoko for Dummies show you how to play and help you develop strategy at a price for 8.99$. Or, go to Costco and purchase it for only 5.99$ There diffuclty ratings are from Easy to Diabotically Difficult.

Lulu - Print-on-demand
Lulu prints your book when you order it. Or, you can download the file and print it yourself.

Dell Magazines
Inexpensive newsstand puzzle collections from the original publisher of Number Place -- sudoku before it was called sudoku.

Michael Mepham
This oft-unheralded sudoku whiz offers several collections in a range of difficulty levels, most with instructions and tips. Published by Time, Inc.

Presented by Will Shortz
Though the staid New York Times doesn't publish sudokus, the paper's crossword editor, Will Shortz, is an expert on the puzzles and lends his name to several titles from St. Martin's Griffin.

Sterling Publishing
Wide selection of puzzles and books geared toward learners and experts. Some books even feature daunting 25-by-25 megasudokus.

Online


Playing sudoku electronically is different from pencil and paper, and can be more difficult, mainly because you can't write down helper numbers. Most programs enable users to print puzzles.

Click EasyEdit to add your favorite sudoku sites to the list below.

Chainki
A collection of Sudoku links.


Fiendish Sudoku
A great site for daily puzzles that range from Easy to Fiendish. It has great print features if you want to take the puzzle with you. The best aspect is that it steps through solutions so that you can learn tricks on how to solve them.

Free Daily Sudoku
A new sudoku puzzle every day to play through your browser. This site also features a massive archive of over 100,000 puzzles, alphabet sudoku, samurai sudoku puzzles and some kids sudokus.

Free Online Solver
A great site where you can use an online solver, or download a sudoku solver for free to solve any given sudoku puzzle!

The Puzzle Player
SUDOKU is the latest puzzle craze. Play Sudoku the Japanese numbers game that's driving everybody mad. We guarantee that once you've tried one SUDOKU puzzle, you'll be hooked.

Cellufun
A free subscription at this site will zap sudoku puzzles to your cell phone. Solutions are scored; compare yours with other players.

The Daily Telegraph, London
Every day, Sudoku generator Michael Mepham provides a free daily puzzle, which you can play online or print out to complete with a pencil.

Miniclip
This games site includes three new sudoku puzzles each day: easy, medium, and hard.

Sudoku.com
This Hong Kong-based site from sudoku's "stepfather" Wayne Gould sells a computer program for download that generates an endless supply of puzzles for the truly addicted.

Sudoku-Ball.com Sudoku-Ball™ is unique version of the Sudoku puzzle. The unique challenge is to solve a 14

Samurai Sudoku network on a spherical object such that the entire network is closed in all directions. The game is powered by Java3D

SudokuCraving.com
Excellent Web 2.0 sudoku community with a new puzzle every day and a ranking system!


Sudoku Fun
English programmer James Pitts offers timed competitive puzzling at one of the first sudoku sites. The site also features links and resources.

Sudoku Madness
Provides puzzles, as well as tips and tools for solving them.

The Telegraph, Calcutta
Slick, virtual sudoku applet for online puzzling. Be warned: The timer starts the second your browser loads the page.

New Scientist Daily Sudoku
One untimed puzzle per day, by Mark Huckvale. Will offer solution for next square (one at a time) if needed.


The Times Online
From the London newspaper that started the craze, a jolly good sudoku site with loads of interactive and printable puzzles. Plus, sudoku in the news.


Web Sudoku
Terrific place to play online, with a straightforward interface and the option to select level of difficulty and whether you want to be timed. Printable puzzlers. You can even challenge friends via email, once you have solved a puzzle.

Sudoku Pro
Over a thousand puzzles that you can play online with a new one added ever hour.

Sudoku Combat
Play Sudoku online against other players. See who solves the sudoku first. Includes options for level of difficulty.

Ultimate Sudoku
Simple and elegant flash site with many play and solve options.

Infoganza
Play online Sudoku and many more puzzles!

Count to Nine
Great site and easy to print out games for when you are on the move..(deadhippo)

Free Sudoku Puzzles
Javascript based online sudoku puzzles.

Clubs and Contests


The solitary nature of sudoku appeals to many. But when you're ready to compete or share notes with others, consider one of these.

Know of a sudoku contest or club? Click EasyEdit and add it to the list below.

The Daily Telegraph, London
E-mail your solution to the day's puzzle to enter the contest.

Puzzles.com
Site dedicated to brainteasers of all types, Puzzles.com includes sudoku contest news.

World Puzzle Federation
In March 2006, this Netherlands-based organization hosted in Italy the first World Sudoku Championship.

United States Sudoku Association
A young organization starting to organize tournaments across the United States.

World Sudoku Championship
Official site of "the Olympics of sudoku," won in 2006 by 31-year-old Czech economist Jana Tylova.

Electronic games


Nintendo DS offers Sudoku in two games: Brain Age and Sudoku Gridmaster.


See also:

You can find sudoku games from a variety of sources, including online web sites and daily newspapers. Some sites are:



]]>Samurai Sudokuhttp://sudoku.wetpaint.com/page/Samurai+SudokuAnonymoushttp://sudoku.wetpaint.com/page/Samurai+SudokuTue, 06 May 2008 22:26:26 CDT


3




]]>Advanced Solving Strategieshttp://sudoku.wetpaint.com/page/Advanced+Solving+StrategiesAnonymoushttp://sudoku.wetpaint.com/page/Advanced+Solving+StrategiesFixed the uniqueness tableSun, 09 Mar 2008 19:43:43 CDTThere are actually only 7 techniques that combined will solve any puzzle....

For an in-depth video tutorial teaching you the most advanced Sudoku Secrets Take a look at the Sudoku Video.

Exclusion [Singleton]
1
 2
 3
 4
 5
 6
 ?
 8
 9






































































Simply put, if there is only one option for a cell, it must be that option.
Likewise, that option is not allowed for other cells in a given constraint(row, column,grid)
In this case, the cell in question (?) can not be a 1,2,3,4,5,6,8 or 9 so it must be a 7.

This alone will solve the easy puzzles.







Uniqueness [Singleton]
1










1





8





?

6

1





?















2


1





42











The reverse of exclusion, here the cell in question could be any number, but it is the only cell in the grid that could be a 1, therefore it must be the 1 for that grid.


These two techniques will solve most medium & hard puzzles








1 2 3


? -
* * 6 - - - - - -
7 8 9
4

-







-







- 4





-






1 * 7




2 * 8




3 6 9

Exclusion [Doubles]
two options for two spaces affecting others
Here is a variation of the above but for doubles. Namely, you have two spaces with only two options [4 & 5] therefore the rest of the constraint (column, row, grid) must have neither the 4 or the 5.

Exclusion removes options from the other cells (-) in a constraint.






 ? *







*
3





6




3
2







9

















2







9






3







Uniqueness [Doubles]
two options for two spaces affecting self
Again, an other variation of the above uniqueness, here we have two spaces (*) which are the only spaces in which a 2 or a 9 are possible for the constraint (grid) therefore, the remaining numbers 1,3,4,5,6,7,8 must be removed, leaving the ? cell the only one where a 3 is possible.

Uniqueness removes options from the unique cells in question.







1 2 3


? -



- - - - - -
7 8 9
4

-







-







- 4





-






1
7




2
8




3
9
Exclusion [Triples]
three options for three spaces affecting others
Variation of the above but for triples. Namely, you have three spaces with only three options [4,5 & 6] therefore the rest of the constraint (column, row, grid) must have neither the 4,5 or the 6.

Be aware that this can show up in a slightly trickier form of three cells, three options such as
[4,5] [4,6] [5,6]. This is harder to recognize than the more repetitious [4,5,6] [4,5,6] [4,5,6]

Exclusion removes options from the other cells (-) in a constraint.




 ? *







*
3





*




3
2







9







6








2







9






3 6






Uniqueness [Triples]
three options for three spaces affecting self
Again, an other variation of the above uniqueness, here we have three spaces (*) which are the only spaces in which a 2,6 or a 9 are possible for the constraint (grid) therefore, the remaining numbers 1,3,4,5,7,8 must be removed, leaving the ? cell the only one where a 3 is possible.

Again, remember that three options for three spaces could also be [2,9] [6,9] [2,6,9].

Uniqueness removes options from the unique cells in question.



*
 ^
 ^





*
 ^
 ^





*
 ^
 ^





1







2











8



4







5














8
Cross Constraints
Row or Column intersecting a Grid
^ = not an 8
This is an interesting issue where a grid is intersected by either a row or a column. In this case, the 8 must appear with in the intersection (*'s) of the cross constraints, and therefore must not occur in the non-shared cells of the two constraints (^)

With these 7 techniques you can now solve ANY sudoku puzzle

]]>The History of Sudokuhttp://sudoku.wetpaint.com/page/The+History+of+SudokuAnonymoushttp://sudoku.wetpaint.com/page/The+History+of+SudokuRemove junk/spam messagesThu, 03 Jan 2008 17:24:06 CST
Though sudoku seemed to achieve ubiquity overnight in 2005, the puzzle has actually been around for decades. So-called magic squares were an occasional pastime among smarties during the days of Ben Franklin, who enjoyed the puzzles. Assigning absolute authorship for the modern version's invention is akin to crediting the wheel's designer, but several key people were integral to the creation of sudoku as we know and play it.

According to The New York Times, 18th-century Swiss mathematician Leonhard Euler studied conundrums called Latin squares, which involved plugging the same set of numbers into each row and column in a grid. Two hundred years after Euler, in 1979, retired American architect Howard Garns contributed puzzles titled Number Place for publication by Connecticut-based crossword giant Dell Magazines. Number Place added a key element to Latin squares, the nine boxes within the overall grid.

Enter Japanese publisher Nikoli Co., which in 1984 published Garns-style puzzles under the name sudoku. Pronounced "soo-DOH-koo," the word roughly translates as "only single numbers allowed." In 1997, Wayne Gould, a New Zealander and retired Hong Kong judge, was vacationing in Tokyo, where he stumbled across a sudoku book. It intrigued him and he developed a computer program to generate more of the puzzles.

When Gould was in London in October 2004, he dropped by The Times newspaper offices and convinced them to try publishing sudoku. Within weeks, the puzzles appeared in print, and readers were hooked. "I came across this puzzle that needed a lot of help and encouragement," Gould told Psychology Today, adding he is "the stepfather," not the father, of sudoku. Today, the puzzles appear in almost 400 newspapers in 60 countries.


Fun Facts


An assortment of interesting sudoku factoids. Click EasyEdit to add your own fun facts below!


  • "Su doku" stems from the Japanese words "su," meaning "number," and "doku," or "single."

  • "The craze, judging by history, will last four, five, six months, and then it will taper off," The New York Times crossword editor Will Shortz told Fortune in October 2005. By the May/June 2006 issue of Psychology Today, Shortz allowed that sudoku had the staying power of crosswords.

  • There are 6,670,903,752,021,072,936,960 possible combinations for completing a 9-by-9 sudoku grid.

  • In Japan, the puzzles are called by their English name, Number Place; in English publications, the puzzles go by their Japanese name, sudoku. Go figure.

  • London newspaper The Independent reported a 700 percent spike in pencil sales from "the thinking person's crack cocaine."

  • British Airways forbids its flight attendants from puzzling over sudoku during takeoff and landing. (Source: The New York Times, 05/06/06)


Resources


For such a simple puzzle, sudoku has a storied past, to which these articles testify.

Read a great article about sudoku online? Click EasyEdit and add it below.

MSNBC, "Addicted to Sudoku"

Conceptis Puzzles, "The History of Sudoku"

MathWorld, "Sudoku"

Time, Profile of Wayne Gould

The Times of London, "The Puzzle That Ate the World"

The Telegraph of Calcutta, "Your Number's Up"


See also:



]]>Sudoku 101http://sudoku.wetpaint.com/page/Sudoku+101Anonymoushttp://sudoku.wetpaint.com/page/Sudoku+101Sat, 10 Nov 2007 12:03:37 CST

Know your way around the block


Much of sudoku's appeal stems from its simple setup and instructions.

Each puzzle consists of a grid (see below) divided into 81 squares, arranged as nine horizontal rows and nine vertical columns. The grid can also be divided into nine boxes, arranged three by three, like a tic-tac-toe board, each containing nine squares. A section is a horizontal or vertical cluster of three boxes.

An unsolved puzzle has a sprinkling of numbers from 1 to 9 preprinted within some of the squares. These are the clues (or givens). As a very general rule of thumb, the more clues on the grid, the easier the puzzle is to solve.

How to play: Fill in the squares so that every row, column, and box contains all of the numbers 1 to 9 only once.

And that is the deceptively simple rule of sudoku. Finding the solution requires only logic. No math is involved. And you should never guess (ideally) to fill in a square.




See also:



]]>miley cyrus rox!!!!!!!!http://sudoku.wetpaint.com/page/miley+cyrus+rox%21%21%21%21%21%21%21%21Lain_Lain_Kyuhttp://sudoku.wetpaint.com/page/miley+cyrus+rox%21%21%21%21%21%21%21%21Thu, 08 Nov 2007 19:44:00 CST

Meeting Room Schedule


Date
Time
Group/Meeting
Venue
June 121 p.m.Book Club2nd Floor Meeting Room















































]]>Stumped and Stumpershttp://sudoku.wetpaint.com/page/Stumped+and+StumpersAnonymoushttp://sudoku.wetpaint.com/page/Stumped+and+StumpersThe climb the ladder and cross the bridge are my (c)Wed, 17 Oct 2007 09:51:26 CDT
P J Naidu

Contact me at sudoku.india@gmail.com

Feeling stumped?
If you're feeling bewildered, post a cry for help in the comments area.


Stumbled upon a super sudoku stumper or found a brain-buster you want to share?
Click EasyEdit to add it to this page (link or actual grid).


Want to find a solution online for a tough puzzle?
Try checking out these resources that can help you solve those tough sudoku problems:

]]>Solving Strategieshttp://sudoku.wetpaint.com/page/Solving+StrategiesESTEEMhttp://sudoku.wetpaint.com/page/Solving+StrategiesSat, 15 Sep 2007 04:00:20 CDTStep-by-Step Solutions
When solving sudoku, there's no right or wrong place to begin, nor is there a preferred way to arrive at the solution. There is, however, only one final solution to the puzzle.

For an in-depth video tutorial teaching you the most advanced Sudoku Secrets Take a look at the Sudoku Video

What are your strategies for solving sudoku?



This is an unsolved sudoku, with the black numbers already provided. Using it, let's discuss some key strategies for solving the puzzle (courtesy of Wayne Gould's Web site, Sudoku.com).













Scanning

Concentrating on the center section, notice that the right and left boxes have 6s, while the center box needs a 6. We can figure out where the missing 6 goes by scanning the middle section's rows. The top row has a 6. The center row has a 6. The bottom row does not. Therefore, the center box's missing 6 goes between its 9 and 1.

















Similarly, by scanning the columns in the middle section for 6s, including the one we just added, we can figure out where the top box's 6 goes: below the 3.






Hatching

When single-scanning doesn't provide enough information, try double-scanning or hatching. In the sample, look at the bottom-left box. It needs a 6. Scan the section's rows for 6s. Then scan the columns. By combining the two, we know that the missing 6 goes to the left of the 4.












Hatching can also reveal the location of the missing 6 in the bottom-right box: to the left of the 2.










Counting Rows and Columns

Remember: Each row and column needs one of each number 1 to 9. In the center vertical section, look at the left column. By counting, we deduce it's missing two numbers: 7 and 8. The center box already has a 7, so therefore the column's missing 7 must go in the bottom box, in the square above the 2.

With the 7 placed, the row is missing only one number: 8. There's nowhere else for it to go but in the center box, below the 4.





Counting Boxes

As the grid fills up, it becomes possible to deduce a box's missing numbers, often by combining process of elimination and scanning. In this example, the center box is missing two numbers: 3 and 5. Scanning the middle row, we see a 3 in the right-hand box. Therefore, the middle box's 3 can't go in the middle square. The only other option is the middle square between the 4 and 7. With the 3 assigned, one blank square remains, and only 5 can go there.







Helper Numbers

Scanning and counting are often enough to complete most of a puzzle. When only a handful of stubborn squares remain blank, it helps to write down within a square its possible numbers. (Some puzzlers use this method from the get-go, but the squares do get crowded with notations.) By writing down these helper numbers, you can help your brain see the patterns of logic emerge.

This example shows helper numbers for the top-left box. To arrive at a square's numbers, scan its row, box, and column for each number from 1 to 9, and write down only those numbers that are possible answers. Take the top-left square, for example: It can't be 1 (its row has one); can't be 2 (column has one); could be 3 (write this down); can't be 4 (row has one); can't be 5 (column has one); can't be 6 (row has one); can't be 7 (column has one); can't be 8 (box has one); could be 9 (write this down).

With the upper-right box's helper numbers added, we can see there is the only possible number for the middle-left square: 1 is the answer. And now that 1 is known, we can see that the middle square has only one possible number: 7.

A full markup like this is often unnecessary. Start by limiting your markups to exclusionary pairs: those numbers that have only two possibilities in a larger square. In the current example, the solver would have only marked the 1, 5, 7 & 9. By doing this, you will quickly identify if two squares have an exclusive relationship (can only be one of 2 numbers) and begin limiting other number choices.

A simpler and quicker technique is to use a simple dot to represent the numbers. A dot in the top left is a 1, top middle is a 2 and so on, like a phone keypad. Your grid will remain much less cluttered this way.


Sample Solution

This is the finished grid for this example puzzle.



















See also:



]]>different kinds of sudoku books!!!!!http://sudoku.wetpaint.com/page/different+kinds+of+sudoku+books%21%21%21%21%21Anonymoushttp://sudoku.wetpaint.com/page/different+kinds+of+sudoku+books%21%21%21%21%21Sat, 14 Jul 2007 16:57:49 CDT
]]>Sudoku Tournamentshttp://sudoku.wetpaint.com/page/Sudoku+TournamentsAnonymoushttp://sudoku.wetpaint.com/page/Sudoku+TournamentsPhiladelphia Inquirer Sudoku National ChampionshipTue, 12 Jun 2007 13:58:32 CDT
Do you compete in sudoku tournaments? Tell us about the experience in the discussion thread below!

  • Do you have news of a local sudoku tournament coming to your town? Click on the "EasyEdit" button and add it!


February 24, -- Silicon Valley Puzzle Day, Morgan Hill, CA
http://www.svpuzzle.org
Sudoku and crossword tournaments and workshops Simply the best

The $50,000 U.S. Sudoku Tournament Schedule:

May 6-7: St. Louis, MO
May 13-14: Minneapolis, MN
May 20-21: Milwaukee, WI
June 3-4: Detroit, MI
June 10-11: Chicago, IL
June 17-18: Indianapolis, IN
June 24-25: Cincinnati, OH
July 8-9: Columbus, OH
July 15-16: Cleveland, OH
July 22-23: Pittsburgh, PA
July 29-30: Philadelphia, PA
Aug. 5-6: New York, NY
Aug. 12-13: New York, NY
Aug. 19-20: Boston, MA
Aug. 26-27: Washington, DC
Sept. 9-10: Raleigh, NC
Sept. 16-17: Charlotte, NC
Sept. 23-24: Atlanta, GA
Sept. 30-Oct. 1: Miami, FL
Oct. 7-8: Tampa, FL
Oct. 14-15: Houston, TX
Oct. 19-21: Philadelphia, PA www.philly.com/sudoku
Oct. 21-22: San Antonio, TX
Oct. 28-29: Dallas, TX
Nov. 4-5: San Diego, CA
Nov. 11-12: Los Angeles, CA
Nov. 18-19: San Francisco, CA
Dec. 2-3: Portland, OR
Dec. 9-10: Seattle, WA
Dec. 16-17: Las Vegas, NV
Jan. 6-7, 2007: Kansas City, MO
Jan. 13-14, 2007: Denver, CO
Jan. 20-21, 2007: Salt Lake City, UT


]]>Simply Sudoku: Catch, Communicate, or Even Cure Sudoku Fever!http://sudoku.wetpaint.com/page/Simply+Sudoku%3A+Catch%2C+Communicate%2C+or+Even+Cure+Sudoku+Fever%21wetpainthttp://sudoku.wetpaint.com/page/Simply+Sudoku%3A+Catch%2C+Communicate%2C+or+Even+Cure+Sudoku+Fever%21Fri, 29 Sep 2006 19:43:40 CDTNot since newspapers started publishing crosswords in the 1920's has a brainteaser inspired so many folks to reach for a pencil ... and eraser.

Are you a sudoku newbie?


  • Read up on the history of this amazingly addictive pastime.



  • Having trouble solving a puzzle? Throw it into the tutor tank and get some help.


Already chronically addicted?





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