This puzzle
- Difficulty
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- Board
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- Hardest step
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Difficulty is the tier you selected. The generator privately checks several exact-tier boards with the human solver, then deals the strongest one for board character; an internal grade is never substituted after your choice.
How to play
Each run of white cells adds to the clue at its head — the number above the diagonal for an across run, below it for a down run. A digit may not repeat inside a run. Use Pencil for candidates and Fast Pencil to fill in the ones you have not worked out — it offers every digit below the run’s total, not just the combinations that actually fit, because spotting those is the puzzle.