DWG-101.3.09
Sudoku #9 · Hard
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About this puzzle
Sheet #9 starts with 28 givens. Our solver completes it in 59 forced placements, 90% of them singles. Hardest step: Naked pair.
Beyond singles, the solution path uses Pointing pair ×2, Naked pair ×4.
The givens are spread unevenly: box 2 holds 5 of them, box 5 only 0 (boxes are counted left to right, top to bottom).
Digit 3 is given most often, 5 times; digit 5 only once.
Where to start
Watch for two cells in one unit with the same two candidates: they claim those digits for themselves.