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How to play
- Fill every white cell with a digit from 1 to 9.
- Each run of white cells adds up to the clue at its start: across clues above the diagonal, down clues below it.
- No digit repeats within a run.
- Some sums can only be made one way, like 3 in two cells (1 + 2) or 24 in three (7 + 8 + 9). Start there.
- Every puzzle has exactly one solution.
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