DWG-101.3.08
Sudoku #8 · Hard
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About this puzzle
Sheet #8 starts with 27 givens. Our solver completes it in 59 forced placements, 92% of them singles. Hardest step: Hidden pair.
Beyond singles, the solution path uses Pointing pair ×2, Naked pair ×2, Hidden pair ×1.
The givens are spread unevenly: box 3 holds 5 of them, box 1 only 1 (boxes are counted left to right, top to bottom).
Digit 1 is given most often, 4 times; digit 4 only 2 times.
Where to start
Two digits that fit only in the same two cells of a unit lock those cells, and every other candidate there can go.