Sudoku - Wikipedia, the free encyclopedia. A typical Sudoku puzzle. The same puzzle with solution numbers marked in red. Sudoku(数独,s. ūdoku?, digit- single) (i, , ; originally called Number Place),[1] is a logic- based,[2][3]combinatorial[4] number- placement puzzle. The objective is to fill a 9.
Play Greater Than Sudoku at Math Playground! Complete the grids with the numbers 1 through 9. A while ago I played around with DataBinding an tried to implement a Sudoku Game similar to Sudoku in. Building a WPF Sudoku Game, Part 1. Challenge your brain and enjoy endless hours of fun with our online puzzles. Solve Sudoku, Binary, Futoshiki and other puzzles for free, right inside your browser! Play Sudoku Quest, a fun version with maps and levels. Click here to play. . and is very similar to the Threes app released a month earlier. [3] [4]. hence the name of the game. After reaching the 2048 tile, players can continue to play.
This kids' educational game requires a more recent version of Flash. Similar Games. 2048; MATH MAN. Sudoku is an educational activity for practicing children's. The approach to playing is similar to Sudoku but with possibly more emphasis on scanning the squares and. Channel 4 included a daily Sudoku game in their Teletext.
Г—9 grid with digits so that each column, each row, and each of the nine 3. Г—3 sub- grids that compose the grid (also called "boxes", "blocks", "regions", or "sub- squares") contains all of the digits from 1 to 9. The puzzle setter provides a partially completed grid, which for a well- posed puzzle has a unique solution. Completed puzzles are always a type of Latin square with an additional constraint on the contents of individual regions. For example, the same single integer may not appear twice in the same row, column or in any of the nine 3.
Г—3 subregions of the 9x. French newspapers featured variations of the puzzles in the 1. Number Place.[5] However, the modern sudoku only started to become mainstream in 1. Japanese puzzle company Nikoli, under the name Sudoku, meaning single number.[6] It first appeared in a US newspaper and then The Times (UK) in 2. Wayne Gould, who devised a computer program to rapidly produce distinct puzzles.
History[edit]. From La France newspaper, July 6, 1. The puzzle instructions read, "Use the numbers 1 to 9 each nine times to complete the grid in such a way so that the horizontal, vertical, and two main diagonal lines all add up to the same total."Number puzzles appeared in newspapers in the late 1. French puzzle setters began experimenting with removing numbers from magic squares.
Le Si. ГЁcle, a Paris daily, published a partially completed 9. Г—9 magic square with 3.
Г—3 sub- squares on November 1. 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. On July 6, 1. 89. Le Si. ГЁcle'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, column and broken diagonals 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 and the additional constraint on the broken diagonals leads to only one solution.[8]These weekly puzzles were a feature of French newspapers such as L'Echo de Paris for about a decade but disappeared about the time of World War I.[9]The modern Sudoku was most likely designed anonymously by Howard Garns, a 7. Connersville, Indiana, and first published in 1. Dell Magazines as Number Place (the earliest known examples of modern Sudoku).[1] Garns's 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.[1.
Multiplayer Sudoku Online for 2. Doyu Sudoku is a multiplayer online sudoku game where you have. where you can choose to play a similar Sudoku or a different.
He died in 1. 98. It is unclear if Garns was familiar with any of the French newspapers listed above. The puzzle was introduced in Japan by Nikoli in the paper Monthly Nikolist in April 1. SЕ«ji wa dokushin ni kagiru(ж•°е—は独身に限る?), which also can be translated as "the digits must be single" or "the digits are limited to one occurrence." (In Japanese, dokushin means an "unmarried person".) At a later date, the name was abbreviated to Sudoku (数独) by Maki Kaji(йЌњжІ» зњџиµ·,Kaji Maki?), taking only the first kanji of compound words to form a shorter version.[1. Sudoku is a registered trademark in Japan and the puzzle is generally referred to as Number Place(гѓЉгѓігѓђгѓјгѓ—гѓ¬гѓјг‚№,Nanb. ДЃpur. Д“su?) or, more informally, a portmanteau of the two words, Num(ber) Pla(ce)(гѓЉгѓігѓ—гѓ¬,Nanpur. Г©?). In 1. 98. 6, Nikoli introduced two innovations: the number of givens was restricted to no more than 3.
It is now published in mainstream Japanese periodicals, such as the Asahi Shimbun. The Times of London began featuring Sudoku in late 2. US newspaper, from the efforts of Wayne Gould, and rapidly spread to other newspapers as a regular feature.[5][1. Gould devised a computer program to produce unique puzzles rapidly.[5]Variants[edit]Variations of grid sizes[edit]Although the 9. Г—9 grid with 3. Г—3 regions is by far the most common, many other variations exist. Sample puzzles can be 4. Г—4 grids with 2.
Г—2 regions; 5. Г—5 grids with pentomino regions have been published under the name Logi- 5; the World Puzzle Championship has featured a 6. Г—6 grid with 2. Г—3 regions and a 7. Г—7 grid with six heptomino regions and a disjoint region. Larger grids are also possible. The Times offers a 1.
Г—1. 2- grid "Dodeka Sudoku" with 1. Г—3 squares. Dell Magazines regularly publishes 1. Г—1. 6 "Number Place Challenger" puzzles (using the numbers 1- 1. A- P). Nikoli offers 2. Г—2. 5 Sudoku the Giant behemoths. A 1. 00. Г—1. 00- grid puzzle dubbed Sudoku- zilla was published in 2. Imposing additional constraints[edit]Another common variant is to add limits on the placement of numbers beyond the usual row, column, and box requirements.
Often the limit takes the form of an extra "dimension"; the most common is to require the numbers in the main diagonals of the grid to also 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. Г—6 grids. Mini Sudoku[edit]A variant named "Mini Sudoku" appears in the American newspaper USA Today and elsewhere, which is played on a 6. Г—6 grid with 3. Г—2 regions.
The object is the same as that of standard Sudoku, but the puzzle only uses the numbers 1 through 6. A similar form, for younger solvers of puzzles, called "The Junior Sudoku", has appeared in some newspapers, such as some editions of The Daily Mail. Killer Sudoku[edit]A Killer Sudoku puzzle. Solution for puzzle to the left. Main article: Killer sudoku. The Killer Sudoku variant combines elements of Sudoku and Kakuro. Alphabetical Sudoku[edit]A Wordoku puzzle.
Solution in red for puzzle to the left. Alphabetical variations have emerged, sometimes called Wordoku; 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. A Wordoku might contain words other than the main word."Quadratum latinum" is a Sudoku variation with Latin numbers (I, II, III, IV, .., IX) proposed by Hebdomada aenigmatum, a monthly magazine of Latin puzzles and crosswords. Like the "Wordoku", the "Quadratum latinum" presents no functional difference with a normal Sudoku but adds the visual difficulty of using Latin numbers. Hypersudoku[edit]Hypersudoku puzzle. Solution numbers for puzzle to the left.
Hypersudoku is one of the most popular variants. It is published by newspapers and magazines around the world and is also known as "NRC Sudoku", "Windoku", "Hyper- Sudoku", and "4 Square Sudoku". The layout is identical to a normal Sudoku, but with additional interior squares defined in which the numbers 1 to 9 must appear. The solving algorithm is slightly different from the normal Sudoku puzzles because of the emphasis on the overlapping squares. This overlap gives the player more information to logically reduce the possibilities in the remaining squares.
The approach to playing is similar to Sudoku but with possibly more emphasis on scanning the squares and overlap rather than columns and rows. Other variants[edit]Puzzles constructed from multiple Sudoku grids are common. Five 9. Г—9 grids that 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 Su.
Doku. The Baltimore Sun and the Toronto Star publish a puzzle of this variant (titled High Five) in their Sunday edition. There are often no givens in the overlapping regions. Sequential grids, as opposed to overlapping, are also published, with values in specific locations in grids needing to be transferred to others. An example of Greater Than Sudoku. A tabletop version of Sudoku can be played with a standard 8. Set deck (see Set game).
A three- dimensional Sudoku puzzle was published in The Daily Telegraph in May 2. The Times also publishes a three- dimensional version under the name Tredoku. There is also a Sudoku version of the Rubik's Cube named Sudoku Cube. There are many other variants.[1. Some are different shapes in the arrangement of overlapping 9. Г—9 grids, such as butterfly, windmill, or flower.[1.
Others vary the logic for solving the grid. One of these is "Greater Than Sudoku". In this a 3. Г—3 grid of the Sudoku is given with 1. Greater Than (> ) or Less Than (< ) on the common line of the two adjacent numbers.[1.
Another variant on the logic of solution is "Clueless Sudoku", in which nine 9. Г—9 Sudoku grids are themselves placed in a 3. Г—3 array. The center cell in each 3. Г—3 grid of all nine puzzles is left blank and form a tenth Sudoku puzzle without any cell completed; hence, "clueless".[1. Mathematics of Sudoku[edit]The results in the following text refer to classic sudoku, disregarding jigsaw, hyper and others.
A completed Sudoku grid is a special type of Latin square with the additional property of no repeated values in any of the 9 blocks of contiguous 3. Г—3 cells. The relationship between the two theories is now completely known, after it was proven that a first- order formula that does not mention blocks (also called boxes or regions) is valid for Sudoku if and only if it is valid for Latin Squares (this property is trivially true for the axioms and it can be extended to any formula).[1. The number of classic 9. Г—9 Sudoku solution grids is 6,6. A1. 07. 73. 9 in OEIS), or approximately 7. Г—1. 02. 1. This is roughly 6.
Г—1. 0в€’6 times the number of 9. Г—9 Latin squares.[1.