World's Hardest Sudoku

Posted by Soulskill on Tuesday July 3, 2012 @08:46PM from the addition-is-tricky dept.

jones_supa writes "A Finnish PhD in mathematics, Arto Inkala, has allegedly created the world's toughest sudoku puzzle. 'There's no straightforward way to define the difficulty level of a sudoku. I myself doubt if this is the hardest in the world, but definitely harder than my previous ones,' Inkala sets off humbly. The news agencies around Europe are nonetheless excited (Google translation of Finnish original). The particular difficulty in this version lies in the number of deductions you have to make in order to fill in a single number on the grid. 'It is a common misconception that the less initial numbers, the harder the puzzle. The most challenging ones have 21-25', the creator adds."

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Re:Easy peasy by Nursie · 2012-07-03 21:03 · Score: 4, Interesting

You don't have to use brute-force solvers. I wrote one that codified my thinking processes and the rules I was operating buy, so that it solved them the way I would.
It's still sorta cheating, but it's not a brute-force.
Re:Not so hard by BlackPignouf · 2012-07-03 22:01 · Score: 4, Interesting

Cool link, thanks!
I love this quote :
Ben Laurie has stated : Sudoku is "a denial of service attack on human intellect".