Friday 12 February 2021

Sudoku no 580 (Tough)

This puzzle has a Hodoku grade of 640. I double-checked it at sudoku9x9.com which solved it using naked singles, hidden singles, one naked pair and one use of Nishio. I cannot claim that I would have spotted this myself but once I saw the explanation it was easy to follow: 

Solve online 

See answer

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