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The World's Hardest Sudoku

So. You think you're smart. Well, Finnish mathematician Arto Inkala challenges you to a game of sudoku, the hardest one ever constructed (on the scale of 1 to 5 as rated by difficulty, this sudoku goes all the way to eleven): Link (Give up? Here's the answer)

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Poster #3 moved the 8 in the lower right hand corner. So that solution is not correct. My results agree with poster #1.

On the other alleged world's hardest Sudoku AI Escargot, my solution is




These were challenging but did not even take a day much less 3 months, unless that was the time Arto Inkala spent to develop them
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