DWG-101.3.10
Sudoku #10 · Hard
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About this puzzle
Sheet #10 starts with 28 givens. Our solver completes it in 57 forced placements, 93% of them singles. Hardest step: Hidden pair.
Beyond singles, the solution path uses Pointing pair ×2, Box–line reduction ×1, Hidden pair ×1.
The givens are spread unevenly: box 4 holds 4 of them, box 5 only 2 (boxes are counted left to right, top to bottom).
Digit 5 is given most often, 5 times; digit 1 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.