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Re: Here's a 9x9 Sudoku for the experts.
Funnily enough there are a couple of possible variations of this one and I did try really hard to make sure there weren't!
The 6s and 2s in the bottom left are interchaneable so you could have:
2 7 6
7 9 3
8 4 5
6 1 2 instead of
6 7 2
7 9 3
8 4 5
2 1 6
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