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The mathematical crossword puzzle. Fill cells with digits 1–9 so each group sums to its clue — no repeats allowed. Combines addition with logic deduction.
Logic skills transfer to business.
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Each "clue" cell shows a sum. Fill the adjacent blank cells with digits 1–9 so they add up to that sum. No digit may repeat within a single sum group. Use the unique-combination constraint to eliminate possibilities.
Memorize key combinations: 3-in-16 must be {1,6,9}, {2,6,8}, {3,5,8}, {3,6,7}, or {4,5,7}. Start with the most constrained groups (fewest cells or extreme sums like 3 or 24).
Brooker, H. et al. (2019). "The relationship between the frequency of number‐puzzle use and baseline cognitive function in a large online sample." Int J Geriatr Psychiatry, 34(7), 932-940.