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French newspapers featured variations of the Sudoku puzzles in the 19th century, and the puzzle has appeared since in puzzle books under the name Number Place.
Number puzzles appeared in newspapers in the late 19th century, when French puzzle setters began experimenting with removing numbers from magic squares.
The modern Sudoku was most likely designed anonymously by Howard Garns , a year-old retired architect and freelance puzzle constructor from Connersville, Indiana , and first published in by Dell Magazines as Number Place the earliest known examples of modern Sudoku.
In , Nikoli introduced two innovations: the number of givens was restricted to no more than 32, and puzzles became "symmetrical" meaning the givens were distributed in rotationally symmetric cells.
It is now published in mainstream Japanese periodicals, such as the Asahi Shimbun. Cognitive scientist Jeremy Grabbe found that Sudoku involved an area of cognition called working memory.
A subsequent experiment by Grabbe showed that routine Sudoku playing could improve working memory in older people. Over six years, he developed a computer program to produce unique puzzles rapidly.
The first letter to The Times regarding Su Doku was published the following day on November 13 from Ian Payn of Brentford , complaining that the puzzle had caused him to miss his stop on the tube.
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.
From July , Channel 4 included a daily Sudoku game in their teletext service. 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, which was won by Hannah Withey of Cheshire.
Four seasons were produced before the show ended in In , a Sudoku website published songwriter Peter Levy's Sudoku tribute song,  but quickly had to take down the MP3 file due to heavy traffic.
British and Australian radio picked up the song, which is to feature [ when? The Japanese Embassy also nominated the song for an award, with Levy doing talks with Sony in Japan to release the song as a single.
Sudoku software is very popular on PCs, websites, and mobile phones. It comes with many distributions of Linux. Many Nokia phones also had Sudoku.
In fact, just two weeks after Apple Inc. Critically and commercially well-received, it generated particular praise for its Sudoku implementation    and sold more than 8 million copies worldwide.
Larger grids are also possible, or different irregular shapes under various names such as Suguru , Tectonic , Jigsaw Sudoku etc.
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.
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 Killer Sudoku variant combines elements of Sudoku and Kakuro. Alphabetical variations have emerged, sometimes called Wordoku ; no functional difference exists 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. Like the Wordoku, it presents no functional difference from a normal Sudoku, but adds the visual difficulty of using Roman numerals.
It is also known as Windoku because with the grid's four interior regions shaded, it resembles a window with glazing bars.
This is one of many possible types of overlapping grids. Tip 2: Break the grid up visually into 3 columns and 3 rows. Now, look for columns or grids that have 2 of the same number.
Logically, there must be a 3rd copy of the same number in the only remaining 9-cell section. Look at each of the remaining 9 positions and see if you can find the location of the missing number.
Now that you know a little more about Sudoku, play and enjoy this free online game. About Easybrain Easybrain is a mobile games publisher with the most popular Sudoku app on the App Store and Google Play, and from August is the proud owner of www.
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