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abcnews.go.com/blogs/headlines/2012/06/can-you-solve-the-hardest-ever-sudoku

Jun 29, 2012 ... Arto Inkala, a Finnish mathematician, designed this Sudoku puzzle, which he claims is the hardest Sudoku yet. (Pekka Carvonen). A Finnish ...

www.telegraph.co.uk/news/science/science-news/9359579/Worlds-hardest-sudoku-can-you-crack-it.html

Jun 28, 2012 ... Readers who spend hours grappling in vain with the Telegraph's daily sudoku puzzles should look away now.

www.telegraph.co.uk/news/science/science-news/9360022/Worlds-hardest-sudoku-the-answer.html

Jun 28, 2012 ... Here is the answer to the world's hardest sudoku, devised by Finnish ... puzzle implies that only by trying all the puzzle can you solve it.

puzzling.stackexchange.com/questions/252/how-do-i-solve-the-worlds-hardest-sudoku

May 19, 2014 ... Just following the chain including contradictions requires to solve 23 .... I'm afraid I think this is the best answer you can get to this question.

www.yahoo.com/news/solve-hardest-ever-sudoku-133055603--abc-news-topstories.html

Jun 29, 2012 ... While Inkala said he believes his is the most difficult Sudoku made to date, he predicted that an even harder puzzle will one day emerge.

www.conceptispuzzles.com/index.aspx?uri=info/article/424

Jul 25, 2013 ... Some of these puzzles can be solved right on this page while others can ... Sudoku is easily the most played and most analyzed puzzle in the ... Boolos called it "The Hardest Logic Puzzle Ever". The original article can be downloaded here. You can read about making this puzzle even harder on the Physics ...

www.dailymail.co.uk/news/article-2166680/True-test-genius-monumental-waste-time-Can-solve-hardest-Sudoku.html

Jun 29, 2012 ... ... or monumental waste of time? Can you solve the hardest ever Sudoku? ... Well , now comes the ultimate test - the world's most difficult puzzle.

gizmodo.com/can-you-solve-the-10-hardest-logic-puzzles-ever-created-1064112665

Aug 8, 2013 ... Easily the hardest was the Killer Sudoku shown above, published on the 9th of November 2012. You can solve this puzzle right here.

www.mirror.co.uk/news/weird-news/worlds-hardest-sudoku-can-you-242294

Aug 19, 2010 ... Could this be the toughest sudoku puzzle ever devised?