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This question already has an answer here:

If you are really smart solve this Sudoku within a day

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BEST OF LUCK

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marked as duplicate by Chowzen, JMP, Deusovi Feb 10 at 0:14

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    $\begingroup$ You probably want to add a no-computers tag, otherwise it's perfectly straightforward :-) $\endgroup$ – Mariia Mykhailova Feb 9 at 19:35
  • $\begingroup$ As @mocarsha2019 has noted, this is "the world's hardest sudoku" and has already been featured on Puzzling SE, and the solution has already been found: 862 751 349 / 943 628 157 / 571 493 286 / 159 387 624 / 386 245 791 / 724 169 835 / 217 934 568 / 438 576 912 / 695 812 473 $\endgroup$ – Hugh Feb 9 at 21:35
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    $\begingroup$ @Kroob.D warning . 3/4 of your questions are duplicate. If you keep on doing same thing ,no more questions will be accepted from this site(puzzling stack exchange) so take care :/ $\endgroup$ – user56760 Feb 10 at 5:29