Mathematician Shows How To Solve Sudoku

[Mulboyne]

USA Today: Mathematician says his Sudoku secret is foolproof
A mathematician says he has finally produced something that people really care about: a foolproof way to beat Sudoku puzzles. "Sudoku has become the passion of many people the world over," says computer scientist J. F. Crook of Winthrop University in Rock Hill, S.C., in the current Notices of the American Mathematical Society. "The interesting fact about Sudoku is that it is a trivial puzzle to solve." Many players and strategy guides intuitively take steps like those Crook outlines, but he says his study offers the first mathematically guaranteed way of solving the puzzles...more...

Read the paper here (PDF)

[Takechanpoo]

面積迷路(Area Maze), 2nd sudoku?

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Area Maze is the creation of Naoki Inaba, one of the world’s most prolific inventors of logic puzzles. He came up with Area Maze after being asked to come up with a puzzle by the head of a crammer school in Japan.

The puzzle is utterly simple to explain: find the missing value, which is denoted by a question mark highlighted in grey. The only mathematics you need to know is that the area of a rectangle is the length multiplied by the width.

http://www.theguardian.com/science/2015 ... ?CMP=fb_gu

[Coligny]

And you are not allowed fractions. Which make the whole game interesting