Sudoku (数独, sūdoku?), also known as Number Place or Nanpure, is a logic-based placement puzzle. The objective is to fill the 9x9 grid so that each column, each row, and each of the nine 3x3 boxes contains the digits 1 to 9. The puzzle setter provides a partially completed grid so that there is only one solution.

Completed Sudoku puzzles are a type of Latin square, with an additional constraint on the contents of individual regions. Leonhard Euler is sometimes cited as the source of the puzzle, based on his work with Latin squares.

The modern puzzle was invented by an American, Howard Garns, in 1979 and published by Dell Magazines under the name "Number Place". It became popular in Japan in 1986, when it was published by Nikoli and given the name Sudoku. It became an international hit in 2005.

Introduction
The name "Sudoku" is the Japanese abbreviation of a longer phrase, 数字は独身に限る (, 数字は独身に限る?), meaning "the digits must occur only once". It is a trademark of puzzle publisher Nikoli Co. Ltd. in Japan.[9] In Japanese, the word is pronounced [sɯːdokɯ]; in English, it is usually spoken with an Anglicised pronunciation, [səˈdəʊkuː] (BrE) [səˈdoʊkuː] (AmE) or [ˈsuːdəʊku] (BrE) [ˈsuːdoʊku] (AmE) (See IPA (International Phonetic Alphabet) or IPA chart for English for notation usage.) Other Japanese publishers refer to the puzzle as Number Place, the original U.S. title, or as "Nanpure" for short. Some non-Japanese publishers spell the title as "Su Doku".

The numerals in Sudoku puzzles are used for convenience; arithmetic relationships between numerals are irrelevant. Any set of distinct symbols will do; letters, shapes, or colours may be used without altering the rules. In fact, ESPN published Sudoku puzzles substituting the positions on a baseball field for the numbers 1–9. Dell Magazines, the puzzle's originator, has been using numerals for Number Place in its magazines since they first published it in 1979.

The attraction of the puzzle is that the rules are simple, yet the line of reasoning required to solve the puzzle may be complex. The level of difficulty can be selected to suit the audience. The puzzles are often available free from published sources and may be custom-made using software.

1. Getting started

There's no right or wrong place to start – but we do have to start somewhere, so let's look at the three boxes at the top of the puzzle.

There's a 1 in the middle box, and a 1 in the box on the right – but the box on the left still needs a 1. At first glance you might think the 1 could go into any of the four empty cells. However, the 1 cannot go in the top row of the box, because the top row of the grid already has a 1. A grid-row has room for only one of each number. Nor can the 1 go in the second row of the box because the second row of the grid already has a 1. There's only one place left for the 1 to go. Roll your mouse to see.

Look for similar patterns elsewhere. You'll see something similar with the 2s in the stack of boxes down the middle. The top box doesn't have its 2 yet. There is a 2 in each of the center and bottom boxes, so we can rule out five of the seven empty cells in the top box. This is not quite the same situation as before, because there are two places the 2 could go. Some people just guess where the 2 should go, but it is better to use logic. It's best to have a reason why a particular number must go in a particular place.

It's time to look in the other direction – at the rows of the grid, not just the columns. The third grid-row from the top already has its 2, so we can rule out one extra cell from the top box. Now there's only one place left for the 2 to go.

Sometimes you can build on success. Let's see if that 2 leads us to success in the top-right box. After considering the rows, we can rule out only four of the seven empty cells. Even after considering the columns, we can rule out only five cells, still leaving two places for the 2 to go. Never mind, we learned something about where the 2 can go in the top-right box.

In fact, you might like to lightly pencil a small ‘2’ into each of the possible cells. In the Sudoku program these small numbers are called pencilmarks and they can be added and removed very easily.

Pencilmarks are useful reminders, but be sparing with them. Using too many can cloud the issues you are trying to clarify.

Solution methods
The strategy for solving a puzzle may be regarded as comprising a combination of three processes: scanning, marking up, and analyzing.

The top right region must contain a 5. By hatching across and up from 5s elsewhere, the solver can eliminate all the empty cells in the region which cannot contain a 5. This leaves only one possibility (shaded green).

Scanning
Scanning is performed at the outset and throughout the solution. Scans need to be performed only once in between analyses. Scanning consists of two techniques:

Cross-hatching: the scanning of rows to identify which line in a region may contain a certain numeral by a process of elimination. The process is repeated with the columns. For fastest results, the numerals are scanned in order of their frequency, from high to low. It is important to perform this process systematically, checking all of the digits 1–9.
Counting 1–9 in regions, rows, and columns to identify missing numerals. Counting based upon the last numeral discovered may speed up the search. It also can be the case, particularly in tougher puzzles, that the best way to ascertain the value of a cell is to count in reverse—that is, by scanning the cell's region, row, and column for values it cannot be, in order to see what remains.
Advanced solvers look for "contingencies" while scanning, narrowing a numeral's location within a row, column, or region to two or three cells. When those cells lie within the same row and region, they can be used for elimination during cross-hatching and counting. Puzzles solved by scanning alone without requiring the detection of contingencies are classified as "easy"; more difficult puzzles cannot be solved by basic scanning alone.

A method for marking likely numerals in a single cell by the placing of pencil dots. To reduce the number of dots used in each cell, the marking would only be done after as many numbers as possible have been added to the puzzle by scanning. Dots are erased as their corresponding numerals are eliminated as candidates.
Marking up
Scanning stops when no further numerals can be discovered, making it necessary to engage in logical analysis. One method to guide the analysis is to mark candidate numerals in the blank cells. There are two popular notations: subscripts and dots.

In the subscript notation the candidate numerals are written in subscript in the cells. Because puzzles printed in a newspaper are too small to accommodate more than a few subscript digits of normal handwriting, solvers may create a larger copy of the puzzle.
The second notation uses a pattern of dots in each square, where the dot position indicates a number from 1 to 9. The dot notation can be used on the original puzzle. Dexterity is required in placing the dots, since misplaced dots or inadvertent marks inevitably lead to confusion and may not be easily erased.
An alternative technique is to "mark up" the numerals that a cell cannot be. A cell will start empty and as more constraints become known, it will slowly fill until only one mark is missing. Assuming no mistakes are made and the marks can be overwritten with the value of a cell, there is no longer a need for any erasures.

Analysis
The two main approaches to analysis are "candidate elimination"[11] and "what-if".[12] In "candidate elimination", progress is made by successively eliminating candidate numerals from cells to leave one choice. After each answer has been achieved, another scan may be performed—usually checking to see the effect of the contingencies. In general, if entering a particular numeral prevents completion of the other necessary placements, then the numeral in question can be eliminated as a candidate. One method works by identifying "matched cell groups". For instance, if precisely two cells within a scope (a particular row, column, or region) contain the same two candidate numerals (p,q), or if precisely three cells within a scope contain the same three candidate numerals (p,q,r), these cells are said to be matched. The placement of those candidate numerals anywhere else within that same scope would make a solution impossible; therefore, those candidate numerals can be deleted from all other cells in the scope.

In the "what-if" approach (also called "guess-and-check", "bifurcation", "backtracking" and "Ariadne's thread"), a cell with two candidate numerals is selected, and a guess is made. The steps are repeated unless a duplication is found or a cell is left without a possible candidate, in which case the alternative candidate must be the solution. For each cell's candidate, the question is posed: 'will entering a particular numeral prevent completion of the other placements of that numeral?' If the answer is 'yes', then that candidate can be eliminated. The what-if approach requires a pencil and eraser or a good layout memory.

There are three kind of conflicts, which can appear during puzzle solving:

basic conflicts - there are only N-1 different candidates in N cell in the area
fish conflicts - when eliminating number from N rows/columns, it will disappear also from N+1 columns/rows.
unique conflicts - this pattern means multiple solutions, all numbers in the pattern exist exactly two times in every area, row and column. If there are only one candidate in the cell, any virtual candidate can be added.
Encountering any of those would indicate that the puzzle is not uniquely solvable. So, if you encounter them as a consequence of "what-if", you use your eraser and go back to try untried alternatives.

Computer solutions
There are two general approaches taken in the creation of serious Sudoku-solving programs: human solving methods and rapid-style methods. Human-style solvers will typically operate by maintaining a mark-up matrix, and search for contingencies, matched cells, and other elements that a human solver can utilize in order to determine and exclude cell values.

Many rapid-style solvers employ backtracking searches, with various pruning techniques also being used in order to help reduce the size of the search tree.

Rapid solvers are preferred for trial-and-error puzzle-creation algorithms, which allow for testing large numbers of partial problems for validity in a short time; human-style solvers can be employed by hand-crafting puzzlesmiths for their ability to rate the challenge of a created puzzle and show the actual solving process their target audience can be expected to follow.

Although vanilla Sudoku puzzles (with 9×9 grid and 3×3 regions) can be solved quickly by computer, the generalization to larger grids is known to be NP-Complete. Various optimisation methods have been proposed for large grids.

Details of computer solutions may be found on the page on the Algorithmics of Sudoku.

Difficulty ratings
The difficulty of a puzzle is based on the relevance and the positioning of the given numbers rather than their quantity. Surprisingly, the number of givens does not always reflect a puzzle's difficulty. Computer solvers can estimate the difficulty for a human to find the solution, based on the complexity of the solving techniques required. Some online versions offer several difficulty levels.

Most publications sort their Sudoku puzzles into four or five rating levels, although the actual cut-off points and the names of the levels themselves can vary widely. Typically, however, the titles are synonyms of "easy", "intermediate", "hard", and "challenging". An easy puzzle can be solved using only scanning; an intermediate puzzle may take markup to solve; a hard or challenging puzzle will usually take analysis.

Another approach is to rely on the experience of a group of human test solvers. Puzzles can be published with a median solving time rather than an algorithmically defined difficulty level.

Construction
Building a Sudoku puzzle can be performed by pre-determining the locations of the givens and assigning them values only as needed to make deductive progress. This technique gives the constructor greater control over the flow of puzzle solving, leading the solver along the same path the compiler used in building the puzzle. Great caution is required, however, as failing to recognize where a number can be logically deduced at any point in construction—regardless of how tortuous that logic may be—can result in an unsolvable puzzle when defining a future given contradicts what has already been built. Building a Sudoku with symmetrical givens is a simple matter of placing the undefined givens in a symmetrical pattern to begin with.

Nikoli Sudoku are hand-constructed, with the author being credited; the givens are always found in a symmetrical pattern.[13] Dell Number Place Challenger (see Variants below) puzzles also list authors. The Sudoku puzzles printed in most UK newspapers are apparently computer-generated but employ symmetrical givens; The Guardian famously claimed that because they were hand-constructed, their puzzles would contain "imperceptible witticisms" that would be very unlikely in computer-generated Sudoku.

Variants

A nonomino Sudoku puzzle, sometimes also known as a Jigsaw Sudoku, for instance in the Sunday TelegraphEven though the 9×9 grid with 3×3 regions is by far the most common, variations abound: sample puzzles can be 4×4 grids with 2×2 regions; 5×5 grids with pentomino regions have been published under the name Logi-5; the World Puzzle Championship has previously featured a 6×6 grid with 2×3 regions and a 7×7 grid with six heptomino regions and a disjoint region. Larger grids are also possible, with Daily SuDoku's 16×16-grid Monster SuDoku [14], the Times likewise offers a 12×12-grid Dodeka sudoku with 12 regions each being 4×3, Dell regularly publishing 16×16 Number Place Challenger puzzles (the 16×16 variant often uses 1 through G rather than the 0 through F used in hexadecimal), and Nikoli proffering 25×25 Sudoku the Giant behemoths. Even larger sizes, for instance 100×100,[15] have been claimed.

Another common variant is for additional restrictions to be enforced on the placement of numbers beyond the usual row, column, and region requirements. Often the restriction takes the form of an extra "dimension"; the most common is for the numbers in the main diagonals of the grid to also be required to be unique. The aforementioned Number Place Challenger puzzles are all of this variant, as are the Sudoku X puzzles in the Daily Mail, which use 6×6 grids.

Puzzles constructed from multiple Sudoku grids are common. Five 9×9 grids which overlap at the corner regions in the shape of a quincunx is known in Japan as Gattai 5 (five merged) Sudoku. In The Times, The Age and The Sydney Morning Herald this form of puzzle is known as Samurai SuDoku.[16] Puzzles with twenty or more overlapping grids are not uncommon in some Japanese publications. Often, no givens are to be found in overlapping regions. Sequential grids, as opposed to overlapping, are also published, with values in specific locations in grids needing to be transferred to others.

Alphabetical variations have also emerged; there is no functional difference in the puzzle unless the letters spell something. Some variants, such as in the TV Guide, include a word reading along a main diagonal, row, or column once solved; determining the word in advance can be viewed as a solving aid. The Code Doku[17] devised by Steve Schaefer has an entire sentence embedded into the puzzle; the Super Wordoku[18] from Top Notch embeds two 9-letter words, one on each diagonal. It is debatable whether these are true Sudoku puzzles: although they purportedly have a single linguistically valid solution, they cannot necessarily be solved entirely by logic, requiring the solver to determine the embedded words. Top Notch claims this as a feature designed to defeat solving programs.

Here are some of the more notable single-instance variations:

A three-dimensional Sudoku puzzle was invented by Dion Church and published in the Daily Telegraph in May 2005.
A book of 3 dimensional puzzles was released by Richard John on the 3rd of November 2006. The book "Sudoku-Stak[1]. The Complete Introduction Book 1" is believed to be the first book of 3D puzzles.
The 2005 U.S. Puzzle Championship includes a variant called Digital Number Place: rather than givens, most cells contain a partial given—a segment of a number, with the numbers drawn as if part of a seven-segment display.
The online journal Speculative Grammarian has published a trio of linguistics-themed Sudoku-like puzzles called LingDoku, which require the solver to solve for two or more variables at once, including a simple 3×3 puzzle,[19], a slightly more complicated 4x4 puzzle,[20] and a Samurai-style puzzle with 3 overlapping 3×3 grids.[21]

An example of a Hexudoku.A Hexudoku (also spelled Hexadoku) is a variant of the game Sudoku, which uses a grid of 16x16 squares instead of 9x9. The name originates from the contraction of the greek-, and latin prefixes hexa-deca, which means 16, and the word sudoku.

Similar to Sudoku, the goal of the game is to complete a not-completely filled grid, such that each row, each column, and each of the 16 marked 4x4 squares contains each number between 1 and 16 exactly once. With 256 squares, the hexudoku has more than 3 times as many squares as the regular sudoku.

Instead of the numbers 1 to 16, sometimes the hexadecimal digits 0-9, a-f are used, or a variant starting at 1: 1-9, a-g. Also a letter-only variant is sometimes used.

Mathematics of Sudoku
Main article: Mathematics of Sudoku
A completed Sudoku grid is a special type of Latin square with the additional property of no repeated values in any 3×3 block. The number of classic 9×9 Sudoku solution grids was shown in 2005 by Bertram Felgenhauer and Frazer Jarvis to be 6,670,903,752,021,072,936,960 [22] (sequence A107739 in OEIS) : this is roughly 0.00012% the number of 9×9 Latin squares. Various other grid sizes have also been enumerated—see the main article for details. The number of essentially different solutions, when symmetries such as rotation, reflection and relabelling are taken into account, was shown by Ed Russell and Frazer Jarvis to be just 5,472,730,538 [23] (sequence A109741 in OEIS). Both results have been confirmed by independent authors.[citation needed]

The maximum number of givens provided while still not rendering the solution unique is four short of a full grid; if two instances of two numbers each are missing and the cells they are to occupy form the corners of an orthogonal rectangle, and exactly two of these cells are within one region, there are two ways the numbers can be assigned. Since this applies to Latin squares in general, most variants of Sudoku have the same maximum. The inverse problem—the fewest givens that render a solution unique—is unsolved, although the lowest number yet found for the standard variation without a symmetry constraint is 17, a number of which have been found by Japanese puzzle enthusiasts,[24] [25] and 18 with the givens in rotationally symmetric cells.

History

Page from La France newspaper, July 6, 1895Main article: History of Sudoku
Number puzzles first appeared in newspapers in the late 19th century, when French puzzle setters began experimenting with removing numbers from magic squares. Le Siècle, a Paris-based daily, published a partially completed 9×9 magic square with 3×3 sub-squares in 1892.[26] It was not a Sudoku because it contained double-digit numbers and required arithmetic rather than logic to solve, but it shared key characteristics: each row, column and sub-square added up to the same number.

Within three years Le Siècle's rival, La France, refined the puzzle so that it was almost a modern Sudoku. It simplified the 9×9 magic square puzzle so that each row and column contained only the numbers 1–9, but did not mark the sub-squares. Although they are unmarked, each 3×3 sub-square does indeed comprise the numbers 1–9. However, the puzzle cannot be considered the first Sudoku because, under modern rules, it has two solutions. The puzzle setter ensured a unique solution by requiring 1–9 to appear in both diagonals.

These weekly puzzles were a feature of newspaper titles including L'Echo de Paris for about a decade but disappeared about the time of the First World War.[27]

According to Will Shortz, the modern Sudoku was most likely designed anonymously by Howard Garns, a 74-year-old retired architect and freelance puzzle constructor, and first published in 1979 by Dell Magazines as Number Place (the earliest known examples of modern Sudoku), because Garns' name was always present on the list of contributors in issues of Dell Pencil Puzzles and Word Games that included Number Place, and was always absent from issues that did not.[10] Sadly, he died in 1989 before getting a chance to see his creation as a worldwide phenomenon.[10]

The puzzle was introduced in Japan by Nikoli in the paper Monthly Nikolist in April 1984[10] as Suuji wa dokushin ni kagiru (数字は独身に限る, Suuji wa dokushin ni kagiru?), which can be translated as "the numbers must be single" or "the numbers must occur only once." At a later date, the name was abbreviated to Sudoku by Maki Kaji (鍜治 真起, Kaji Maki?), taking only the first kanji of compound words to form a shorter version.[10] In 1986, Nikoli introduced two innovations: the number of givens was restricted to no more than 32[citation needed], and puzzles became "symmetrical" (meaning the givens were distributed in rotationally symmetric cells).[9] It is now published in mainstream Japanese periodicals, such as the Asahi Shimbun.

Popularity in the media
This article or section deals primarily with United Kingdom and does not represent a worldwide view of the subject.
Please improve this article or discuss the issue on the talk page.

In 1997, retired Hong Kong judge Wayne Gould, 59, a New Zealander, saw a partly completed puzzle in a Japanese bookshop. Over six years he developed a computer program to produce puzzles quickly.[28] Knowing that British newspapers have a long history of publishing crosswords and other puzzles, he promoted Sudoku to The Times in Britain, which launched it on 12 November 2004 (calling it Su Doku).

It was rapidly introduced by The Daily Telegraph, the Daily Mail and The Independent. By April and May 2005 the puzzle became a national phenomenon and was introduced to several other national British newspapers including The Guardian, The Sun (where it was labelled Sun Doku), and The Daily Mirror.[citation needed]

The rapid rise of Sudoku in Britain from relative obscurity to a front-page feature in national newspapers attracted commentary in the media and parody (such as when The Guardian's G2 section advertised itself as the first newspaper supplement with a Sudoku grid on every page [29]). Recognizing the different psychological appeals of easy and difficult puzzles, The Times introduced both side by side on 20 June 2005. From July 2005, Channel 4 included a daily Sudoku game in their Teletext service. On 2 August, the BBC's programme guide Radio Times featured a weekly Super Sudoku.

The world's first live TV Sudoku show, 1 July 2005, Sky One.The world's first live TV Sudoku show, Sudoku Live, was broadcast on 1 July 2005 on Sky One. It was presented by Carol Vorderman. Nine teams of nine players (with one celebrity in each team) representing geographical regions competed to solve a puzzle. Each player had a hand-held device for entering numbers corresponding to answers for four cells. The audience at home was in a separate interactive competition.

Later in 2005, the BBC launched SUDO-Q, a game show that combines Sudoku with general knowledge. However, it uses only 4x4 and 6x6 puzzles.

Early in 2006, Sudoku was brought to a younger generation for the DS, a handheld game console developed and manufactured by Nintendo. Sudoku made a humble feature in Brain Age: Train Your Brain in Minutes a Day!, an educational game developed by Japanese neuroscientist Ryūta Kawashima. With the popularity of sudoku rising, a game called Sudoku Gridmaster was released focusing solely on the logic-based numerical puzzle. At approximately the same time, Sudoku Mania was released. However, compared to the success of the previous two titles, Sudoku Mania received generally negative reviews from gaming critics and gamers.

Sudoku is now also a very popular part of the games available for mobile phones. Gameloft, Guardian Unlimited, World Sudoku League and Playcom are some of the distributors.

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Sudoku, online sudoku puzzles, daily sudokuSudoku is the latest puzzle craze. Play Sudoku, the Japanese numbers game that’s driving everybody mad. Once you’ve tried one Sudoku puzzle, ...
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Math Games:Sudoku VariationsOffers detailed descriptions and illustrations of Sudoku variations, including Diagonal, Cubical, Even-Odd, and hybrids. Also includes a short history.
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BrainBashers : Daily SudokuOffers daily puzzle in one of three difficulty levels. Archive of daily puzzles and an assistant.
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Jigsaw Sudoku - Free Online Sudoku GameColorful Flash-based 4x4, 6x6 and 9x9 Sudoku games. Includes easy, medium and hard levels. Also suitable for kids and Sudoku beginners!
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Sudoku @ paulspages.co.ukOffers random, crafted, and non-standard puzzles. Includes hints and import/export tool.
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How to solve sudoku puzzles @ paulspages.co.ukGuide to solving sudoku puzzles. ... If you've arrived here direct from a search engine, you may like to try sudoku@paulspages.co.uk - it's a web page that ...
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Sudoku Today : Sudoku, Sudoku Puzzles, Daily Sudoku PuzzlesSudoku today provides a lot of sudoku puzzles in easy, medium and hard levels.
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Sudoku - Los Angeles TimesYou can play the most recent 30 days of the the L.A. Times Sudoku for free. ... 3 more Sudoku puzzles updated daily 2 jumbo size crosswords, updated every ...
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Sudoku -- from Wolfram MathWorldThe Sudoku was published anonymously by Garns (1979), who created the puzzle at age 74, and then promptly relegated to obscurity. It became popular in Japan ...
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Airwaves Sudoku LeagueLeague of online competitors. Scoreboard, rules, FAQ, hall of fame, and instructions. [English/Czech]
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Print Free Sudoku PuzzlesPrint sudoku puzzles free from your computer in a variety of skill levels.
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instructables : Solve Sudoku (Without even thinking!)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 ...
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Samurai SudokuSamurai Sudoku puzzles and solver with hints and step-by-step solutions. Print samurai sudoku puzzles at several grid sizes.
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How to Solve a Sudoku - WikiHowSudoku is a puzzle that has swept the world. It is very fun to play, but can be tricky and confusing at first. The object is to put the numbers 1-9 in every ...
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Sudoku Solver by LogicA Sudoku Solver that tries to solve Sudokus by logic only.
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Online SudokuOnline Sudoku lets you to play sudoku online. Online Sudoku is the javascript version of the popular sudoku puzzle/game.
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Top 50 Sudoku sites, your first stop for finding sudoku50 of the best sudoku sites on the internet. ... Welcome to the Top 50 Sudoku sites! from here you will find links to daily Sudoku puzzles, samurai Sudoku, ...
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SudokuEach Sudoku is made of 81 cells, divided into 9 rows, 9 columns, and 9 boxes. The boxes are 3 cells by 3 cells, and are marked off by the thicker lines. ...
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sudoku: Definition and Much More from Answers.comSudoku Quest The puzzle game that has taken the world by storm. Do you Sudoku? Download full version Try Sudoku Quest for Free! (2.
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Free Sudoku - Play Online - Super Sudokus PuzzlesOffers hints, solution checking and grids in sizes other than 3x3.
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Sudoku Game BoardA Sudoku playing board that enforces the rules -- it only allows unique numbers in any row, column, or section.
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The Sudoku GrandmasterThe Official homepage of the World's only Sudoku Grandmaster.
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Sudoku Solver by Andrew StuartSudoku Solver by Andrew Stuart. Shows the logic behind solving Sudoku square by square.
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FT.com / Arts & Weekend / SudokuFT.com will bring you a Sudoku puzzle every day from Monday to Saturday. Saturday’s puzzle will also be published in the Weekend FT newspaper. ...
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ireland.com - The Irish Times - SudokuThe Irish Times's Sudoku puzzles are updated six days a week. Each day an easy, medium, and hard sudoku are published. Download ...
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Resco Sudoku for Pocket PCSudoku -- the way to play original Sudoku puzzles! Optimized for Windows Mobile-based Pocket PC.
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Minimum SudokuA project collecting Sudoku with the smallest number of givens that are still uniquely solvable. Offers the puzzle for download in text format.
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Reading RoomReading Room is a leading digital communication company based in London and Australia.
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American Prospect Online - ViewWebThere are two reasons why Sudoku drives so many crossword experts to drink. First, the artistic reason: Some puzzle writers view Sudoku as too boring, ...
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Number Logic :: SudokuNumber Logic - The web's premier online sudoku puzzle game.
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Advanced Sudoku StrategiesSudoku Solver by Scanraid Ltd. Shows the logic behind solving Sudoku square by square.
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Make and Print SUDOKU Puzzles! (makes a PDF file)edHelper.com offers hints - you can customize how you'd like your Sudoku! ... Make a Sudoku Puzzle (PDF file created) - You set the various options! ...
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Mark Huckvale's Su Doku Puzzle MakerFree sudoku (or su doku) puzzle maker, solver and workpad.
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What is Sudoku: rules, history and terminologyAt a later date, the name was abbreviated to Sudoku (pronounced sue-do-koo; ... Nikoli still holds the trademark for the name Sudoku; other publications (at ...
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Daily Sudoku PuzzleOffers daily puzzle for printing. Also includes archive, online solver, and solving tips.
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Count to Nine Sudoku ( easiest ) - Play and Print Free Sudoku ...Free Online Personalized Google Home Page Sudoku Puzzle Module. Count to Nine creates a unique Sudoku number puzzle every time you visit Google.
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Sudoku Original - Presented by AddictingGamesThe original Japanese Sudoku game, puzzles ranging from easy to very hard.
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Sudoku - Wikipedia- [ Translate this page ]Erklärungs des Spieles und der Lösungsmethoden sowie Geschichtliches.
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Braingle: Sudoku Logic PuzzleOnline playable Sudoku puzzles with high scores and multiple difficulty levels. ... Sudoku is a popular logic placement puzzle that has been gaining ...
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GameHouse Sudoku!GameHouse Sudoku is a simple, addictive game of logic that will leave ... Play GameHouse Sudoku! - New games added every week; - Unlimited play; Learn More. ...
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Sudoku Addict - Puzzles, Walkthroughs and TipsSudoku is the new number puzzle driving people around the country crazy. Also known as Number Place in the US it is deceptively simple, you can start a ...
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Essential Guide and Links to SuDokuEssential guide to SuDoku puzzles and related resources on the Internet's World Wide Web. Also commonly spelled Su Doku and Sudoku, this is a number ...
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Sudoku Puzzle SolverShareware puzzle solver. Generate and solve puzzles, print out the grid for solving by hand, tips and tutorials with online discussion forums.
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boldts.net - Sudoku - Nonomino PuzzlesSince the 3x3 groups in regular Sudoku are themselves nonominos, ... How do you solve nonomino Sudoku puzzles? Exactly like you would solve regular Sudoku ...
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Sudoku Loo Roll - I Want One Of ThoseLong, strong and entertaining, Sudoku Loo Roll will make those occasional visits a ... Customers who purchased Sudoku Loo Roll also purchased the following: ...
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Sudoku: Surfing the Net with KidsFree Sudoku puzzle to play online or to print. Commonly misspelled as suduko or sodoku.
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Python Sudoku HomepageProgram to create or resolve sudokus. ... Python Sudoku is a text and graphical program (gtk interface) to create or resolve sudokus. ...
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Sudoku Electronic Handheld Games and Books - BuySudokuPuzzles.comGreat selection of sudoku puzzles, electronic handheld games, books, and sudoku board games at low everyday prices.
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Prize SudokuOffers competitions for prizes. Traditional Sudoku, Godoku (letters) and Super Sudoku (16x16).
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Sudoku Solver: a utility from DeadMan's HandleSudoku Solver: an economical utility. ... Welcome to the Sudoku (Su Doku) solver page, an economical utility for those who like to have their Sudoku ...
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Sudoku - Wikipedia, la enciclopedia libre- [ Translate this page ]La solución de un Sudoku siempre es un cuadrado latino, aunque el recíproco ... Es muy probable que el Sudoku se crease a partir de los trabajos de Leonhard ...
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Précis de sudoku- [ Translate this page ]Le sudoku est devenu un jeu de logique très populaire. Ce Précis de sudoku permet de découvrir les origines de ce jeu et d'apprendre à le résoudre par la ...
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Daily SudokuA free Sudoku puzzle for you to enjoy every day - get your daily Sudoku here.
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Sudoku Programmers :: IndexDiscussion forum for developers of programs such as creators, helpers, and solvers. Discussions include solving techniques, creating puzzles, mathematics, ...
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How To Solve SuDoku Puzzles - IntroductionHow to Solve SuDoku Puzzles - Introduction. This turorial will introduce you to some basic solving strategies for sudoku puzzles.
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Sudoku - Discussions around the Sudoku Puzzle GameA forum for fans as well as people wanting to learn more about Sudoku.
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SUDOKU Online- [ Translate this page ]Daily Sudoku Online. Friko.net vous présente la seconde version du résolveur de grilles de sudoku.
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Mathematics of Sudoku - Wikipedia, the free encyclopediaThe mathematical analysis of Sudoku falls into two main areas: analyzing the ... The mathematics of Sudoku is a relatively new area of exploration, ...
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Sudoku Works - PC softwareThe ultimate Sudoku puzzle PC shareware program. Free trial download.
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Sudoku in ExcelAlso, if you're a fan of the Sudoku idea, why not have a look at the Diamond Sudoku that we set for students in a recent maths competition. ...
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Sudoku - Wikipédia- [ Translate this page ]Le nom sudoku (数独) est né de l'abréviation de la règle du jeu japonaise ... Le lien entre le sudoku et le problème des 36 officiers est la contrainte qui ...
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Sudoku Puzzles For BeginnersSudoku Puzzles For Beginners contains a collection of sudokus, ordered by difficulty level.
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DracosoftDracosoft's Sudoku is a challenging number-puzzle game filled with logical ... Based on the popular Japanese number game, Dracosoft's Sudoku not only ...
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DracosoftDracosoft’s Christmas Sudoku is a great iconic twist on the standard Sudoku ... Derived from the traditional style Sudoku puzzles, Dracosoft’s Christmas ...
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SUDOKU PuzzlesCrossword Express for Mac and Windows is the most versatile crossword system available today. Enjoy our puzzles or publish your own interactively on the ...
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Su DokuGwerdy's SuDoku Solver has a very clear explanation of their algorithm. Most elegant of all, we think, is the Su Doku solver in three lines, a solution by ...
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Daily SudokuOnline database of Sudoku puzzles, including a builtin JavaScript solver, Dictionary of terms and solving techniques.
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Play online Sudoku puzzles with 3 difficulty levels + Solver + ...Play online sudoku puzzles with three difficulty levels, tutorial, solver and multi-player session.
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Sudoku Online, Play Samurai Sudoku, Twodoku and Wordoku online ...Sudoku is the addictive Japanese number puzzle craze that is sweeping the UK. Fill in a nine by nine grid so that in each row, column and small square the ...
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Goobix.com: Online SudokuOnline playable Sudoku puzzle. ... Online Sudoku - The Rules. Here you can play, on the web, Sudoku puzzles online. The 9x9 grid ...
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Free SUDOKU puzzleEvery 15 minutes new free SUDOKU puzzles - easy, medium and hard online SUDOKU puzzles.
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Heaneyland!: Snakes on a Sudoku!This puzzle works just like a regular sudoku, except the internal 3x3 ... Snakes on a Sudoku is now an honest-to-Samuel-L.-Jackson book (available here and ...
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Free Sudoku gamePlay Sudoku, the popular logic puzzle game. The best flash Number Place game on the net, with puzzles from easy to challenging.
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Sudoku made easierA method to help the solving of sudoku puzzles. ... Sudoku (or su doku) is a contraction of the Japanese phrase suji wa dokushinsha ni kagiru which may be ...
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TeachersAndFamilies PuzzlesTeachersAndFamilies Puzzles.
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Konfabulator - Gallery - Sudoku PillIt's the popular Sudoku game that is taking the world by storm! ... The first one I tried had multiple solutions (against Sudoku rules). ...
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Math Trek: Sudoku Math, Science News Online, June 18, 2005A logic puzzle craze puts the spotlight on Latin squares.
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Let's Make Sudoku!This page was moved to. http://www.pro.or.jp/~fuji/numplace/makeproblem/numplace01.html.en. when you do not change automatically, ...
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Sudoku Player :: Free Sudoku-Suduko PuzzlesAn online free Sudoku puzzle game. Also offers information about the game of suduko, it's origins, and how to play.
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Sudoku for Mac : Sudoku CompanionSudoku for Mac - Sudoku Companion assists you in solving Sudoku on your Mac (Mac OS X 10.4 Tiger required).
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Sudoku NewsSudoku News continually updated from thousands of sources around the net.
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PepsiMan » Blog Archive » SudokuCayenne has added a sudoku game to DSLinux. There are a few known problems. Try it out and send feedback to Cayenne. This entry was posted on Monday, ...
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Sensible SudokuSensible Sudoku is a fun and carefully designed Sudoku with a great interface, elegant audio and enjoyable gameplay.
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Web Sudoku - Billions of Free Sudoku Puzzles to Play OnlineEach Sudoku has a unique solution that can be reached logically without guessing. ... Play anywhere on your Laptop with Web Sudoku Deluxe!
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Kanji-Sudoku - learning Japanese while solving Sudoku PuzzlesKanji-Sudoku - learning Japanese while solving Sudoku Puzzles.
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Erlang: SudokuActually, no, I don't, I don't really like sudoku at all but I decided to write a solver ... Some ideas to make the world's leading scalable sudoku solver: ...
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Sudoku Puzzle GeneratorSudoku Puzzle Generator enables Sudoku puzzles to be created, played, ... Sudoku Puzzle Generator Version 1.7 released for Windows and Linux. ...
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IGN: Go! Sudoku ReviewIGN is the ultimate resource for Go! Sudoku reviews featuring in-depth reviews from our award-winning editorial staff along side thousands of user reviews.
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A P R E S S . C O M : Programming SudokuI was fascinated with Wei-Meng Lee’s book on Sudoku programming. ... Programming Sudoku provides you with great approaches to building and solving Sudoku ...
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Youth Against Sudoku - 81 squares is enough to waste your dayYouth Against Sudoku kokoaa maailman sudoku-ristikot ja toimittaa ne takaisin Japaniin.
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Youth Against Sudoku - 81 squares is enough to waste your dayYouth Against Sudoku kokoaa maailman sudoku-ristikot ja toimittaa ne takaisin Japaniin. ... The matter is in the hands of Youth Against Sudoku (YAS). ...
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Free Samurai Sudoku (Gattai-5) puzzlesOffers printable sudoku samurai puzzles for download.
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Nintendo.com Games : Sudoku GridmasterSudoku Gridmaster Mastering sudoku has never been easier, thanks to Sudoku Gridmast When you fire up Sudoku Gridmaster, it doesn't take long to figur.
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Open Directory - Games: Puzzles: Brain Teasers: SudokuHirofumi Fujiwara's Sudoku - Offers a tutorial for creating puzzles, a Java-based solver, ... Solving Sudoku - Step by step guide to solving sudoku puzzles. ...
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Tucows Downloads - Sudoku 0.2 Freeware SoftwareSudoku 0.2, This is a number puzzle for your handheld. Downloads and software from Tucows the largest online software download site.
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Web Sudoku: review, discussion, hints, tips and walkthrough at Jay ...Web Sudoku Sudoku is a popular puzzle game in Japan that has been spreading throughout ... Web Sudoku The game is simple to play, and once you get started, ...
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PHP Classes - Class: Draw SudokuRender Sudoku game puzzle boards. ... This class can be used to render boards of Sudoku game puzzles. It can read the positions of the numbers from a text ...
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Sudoku Solver | Puzzle iTThe goal of a Su Doku problem is to complete the published grid so that no number appears more than once in any row, column or 3x3 subgrid.
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Greenpeace Sudokusudoku puzzle seadoku bottom trawlng. ... Play SeaDoKu Online PRINT VERSIONS Sudoku Puzzle One · Sudoku Puzzle Two. Generic Spacer. Menu Corners. News ...
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VSJ | Articles | Solving Sudoku with SQLA Sudoku puzzle comes with numbers already present in some of the cells. ... For most puzzles marked as ‘easy’ in Sudoku puzzle books, the rules discussed ...
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Freeware Palm: Sudoku v1.22Best Sudoku game ever for a handheld, until they add those zeros to the game! I never knew until I downloaded it on January 23rd that your Sudoku game has a ...
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Creating Passionate Users: If Tech Companies Made SudokuSudoku is perfect. It can be as engaging, addictive, and flow-inducing as the ... FYI, Microsoft has already released (on MSDN) a version of Sudoku and I ...
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Solving sudokus - ContentsSolving sudokus - Contents. Elementary. Intro · The easiest methods · Baby steps · Forced digits · Forced cells · Forced pairs · Two pairs · Double pairs ...
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dosudoku.com: play sudoku onlinedosudoku.com: play Sudoku online with the unique interactive player, and choose from a wide range of difficulty levels.
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Su Doku Work Pad & Solution aid with Sudoku puzzle generatorSudoku.xls FREE solution aid for SuDoku puzzles. ... sudoku-xls Su Doku solution aid and puzzle greator is loading . ...
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OK, SudokuPeople say that the game of Sudoku makes a good TDD example. ... I could start, I suppose, with a simple Sudoku game and try to TDD its solution. ...
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SourceForge.net: GNOME SudokuGNOME Sudoku is a GNOME-based puzzle game. Sudoku is a popular Japanese logic game. GNOME Sudoku intends to provide a simple interface for playing, saving, ...
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Sudoku puzzle of the dayWe put a new Sudoku puzzle here every day of the year at 1200 EST (GMT -5). ... If you want to try a non-standard Sudoku-like puzzle, look at this one. ...
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Amazon.com: The Official Book of Sudoku: Book 1: Books: PlumeAmazon.com: The Official Book of Sudoku: Book 1: Books: Plume by Plume.
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Sudoku, Sudokus, Sodoko, Soduku, Suduku, Soduku, Sodoku, Sodoko ...Sudoku, Sudokus, Sodoko, Soduku, Suduku, Soduku, Sodoku, Sodoko, Sodokus, Suduko, Sudoko, Soduko - no matter how you spell it - it is a fascinating puzzle ...
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Sudoku Puzzles - Electronic GamesHandheld Sudoku puzzles, electronic games. Touch screen and hand control. LCD displays.
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A Sudoku Solver in CRating Sudoku puzzles is a rather subjective thing, and thus it is difficult ... (I've seen a pathological puzzle from the Minimum Sudoku web site require ...
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Sudoku - free daily on Stuff.co.nzMags 4 Gifts · Cuisine · NZ House & Garden · NZ Magazines. Invalid story 3598312. Make Stuff My Homepage · Email Alerts · Text Alerts. Sudoku Headlines ...
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Seed: Microscopy and the Art of SudokuOne day, while wrapping his brain around a Sudoku grid, Elser realized that the tension ... In the process of writing algorithms to solve Sudoku puzzles, ...
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Free Sudoku Script for your Website - JavaScript with PHP backendWe offer a 100% free sudoku script to webmasters who wants to give this opportunity to their visitors through a sudoku javascript. It is all very simple! ...
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Airwaves Sudoku LeagueTurnaj pro žáky ZŠ a SŠ. Informace o kvalifikaci a registraci, přehled cen, průběžný a denní žebříček, diskuse a černá listina.
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Sudoku-GrokSudoku-Grok is the name of the web-application before your eyes. Sudoku-Grok is intended ... With the help of Sudoku-Grok you can, at any stage of a game: ...
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Sudoku Assistant/SolverJavaScript-based gameboard and solver. Can use cross-hatch scanning and subset elimination.
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Sudoku Assistenten - ProgramFree software to create, solve and learn about sudoku.
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[PDF] Enumerating possible Sudoku gridsFile Format: PDF/Adobe Acrobat - View as HTML
In this note, we discuss the problem of enumerating all possible Sudoku grids. ... of valid Sudoku grids. In the discussion below, we will refer to ...
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Ridiculopathy.com: Crappy Flash Game: sudokuPlay with letters or numbers in the grid. Includes high scores, hints and move verification. [Requires Flash]
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Sudoku PuzzleSudoku Ace computer program offers millions of randomly generated different ... Since Sudoku Ace isn’t pen and paper, there are an unlimited number of ...
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Buy Plug & Play Games, Sudoku Electronic Toys from Toys & Games ...Looking for Plug & Play Games, Sudoku in Electronic Toys? BizRate has the lowest prices and best customer reviews. Compare Electronic Toys prices and store ...
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Daily Interactive Sudoku, Reader's Digest CanadaHome · Win · Free games, Crosswords, Word Power, Sudoku! Holiday Recipes, Decoration, Holiday Stories, Carols and More! Welcome to the new Reader's Digest ...
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sudokuSudoku. Includes an overview of how Sudoku is solved, a monthly contest and a downloadable ... Check for products which rely on Sudoku Puzzles by Pappocom . ...
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Daily Killer Sudoku, Samurai, Hanjie (griddlers) and moreTo the best of my knowledge, this is the first and only Sudoku book that contains only Killer Samurai Sudoku puzzles. The book is available as an e-book ...
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Pocket SudokuPocket Sudoku ver 0.70 worked properly on my W-Zero3 PDA. It is excellent. ... NET Compact Framework 2.0 in order to run Pocket Sudoku. Download .NET CF 2.0 ...
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Web 2.0 - Sudoku Resolver#
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Sudoku Puzzle - Easy - New York TimesNow every day on NYTimes.com you can solve a new sudoku puzzle that matches your ... In Sudoku, Nine Little Numbers Add up to a Big Challenge (May 1, 2006) ...
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The Sudoku Web-Ring CommunityThe purpose of this Web-Ring Community is to bring together all the best sites and resources about the logical puzzle game: Sudoku.
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.. Solution-Sudoku.com ..free online Sudoku puzzle solver, free sudoku solver software for pocket pc and smartphone.
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Free SudokuFree sudoku puzzles from Your Index, come and play our flash sudoku game.
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AOL Games: Buku SudokuPlay your favorite online games, free from AOL Games. Offering free games of every style - arcade, cards, word, puzzles, sports and more.
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Rorohiko Ltd.The generated Sudoku are stored in two InDesign tables - one with the ... Before you can use the 'Sudoku Generator' you also have to install our free ...
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Sudoku Of The Day8 Lover's Themed Sudoku to download, print and solve - solve them with someone ... Come back every day, and see if you can solve our Sudoku Of The Day! ...
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Daily Sudoku puzzle – play a new game of Sudoku every day on ...Suduko - the Japanese numbers game. Play a new game every day on vnunet.com.
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ADDoku by Lovatts, Killer Sudoku. Addoku is the latest interactive ...Killer Sudoku or Addoku is the latest interactive puzzle from Lovatts - a combination of Sudoku and Kakuro that’s twice the fun.
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SudokuSudoku generator and solver. ... All Sudoku puzzles have been made using the program described below, and are fetched from a MySQL database. ...
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Sudoku Puzzles on SquidooThe modern form of Sudoku was invented in the late 1970's by an American puzzle maker by the name of Howard Garnes. His puzzle, termed 'Number Place', ...
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Free Sudoku Puzzles to Play Online,Jigsaw Sudoku, Jigsaw puzzle ...Free Sudoku Puzzles to Play Online,Jigsaw Sudoku,Killer Sudoku.
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SudokuIn sudoku there are only a few basic rules. You have to fill in the 9x9 grid so ... If you like sudoku, you'll love Flip Words, great puzzle solving fun. ...
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SudokuSudoku is a logic puzzle. It is typically presented as a square grid with 9 ... In the directory below, you will find many free sudoku you can print and use ...
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Science News for Kids: GameZone: SudokuA sudoku puzzle usually consists of a nine-by-nine grid. Some of the spaces contain ... You'll find more Sudoku puzzles at http://www.websudoku.com/. ...
www.sciencenewsforkids.org/pages/gamezone/sudoku.asp