Simply Sudoku Blog

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I can play sudoku relatively well. I can beat most all the way up to and including hard without guessing at an answer. But once you get to levels above hard (some call them insane or tough), I find it impossible to beat it without guessing and testing at least once. I [...]

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I’ve been working on a hard Sudoku puzzle for a few hours now, and it’s driving me crazy. I have access to the solution, but I want to understand how I can solve it.
The solution so far is as follows:
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| 6 3 ? | 8 ? 5 | ? ? ? |
| ? ? 1 [...]