Maybe it’s having a nanna napwhat have you done to the sukoku it won't open
totally agree Ray- happens quite often. And sometimes with 2 sets of numbers whereas this one has the same set. I've raised it before and someone else who was replied with - can't happen. Thankyou for posting an actual sampleSudoko puzzles are supposed to be capable of being solved by a process of logical illimination without any guess work. They should have only one solution.
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How do you complete this without a guess?