My understanding is a valid sudoku should have 1 unique solution. But in this one I just finished, the circled numbers seem to be interchangeable. Am I missing something?
Are the bolded numbers the starting numbers? In that case, one of those circled numbers was a starting value, and swapping them would essentially result in a "different" puzzle.
Ok, yes, this explains it. Thank you
This. There aren't multiple solutions because their orientation is set by the one given number. Intentionally so.
looks like the 9 in the bottom box is a pre-filled number, so couldn't be swapped
I’ve had a couple of those in the past where there is something like this. I think it’s a low chance but it is perfectly possible for it to happen.
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