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)

812753649
943682175
675491283
154237896
369845721
287169534
521974368
438526917
796318452
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It's too bad Google Goggles will solve it in under a minute.
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After 15 rounds trying I get an answer as follows:
869472153
213658947
475391286
154937628
386245791
927186534
531724869
748569312
692813475
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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

162857493
534129678
789643521

475312986
913586742
628794135

356478219
241935867
897261354

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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by logic and without a computer, solved Inkala's last three, world's hardest sudoku's, escargot, mirror (2010) and the 2012 puzzle.
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