Game technique · Kakuro
Required Digits in Kakuro Runs
When every valid combination for a run contains a digit, that digit must appear somewhere in the run.
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When every valid combination for a run contains a digit, that digit must appear somewhere in the run.
Example
Compare possible combinations with crossing clues to find the only cell that can hold the required digit.
Key point
When every valid combination for a run contains a digit, that digit must appear somewhere in the run.