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Eliminate duplicate numbers in a grid by blackening cells. No two blackened cells can be adjacent, and all remaining white cells must stay connected. A deep logic puzzle from Japan.
Logic skills transfer to business.
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Click cells to blacken them. Rules: (1) No row or column can have duplicate numbers among white cells. (2) No two blackened cells can be horizontally or vertically adjacent. (3) All white cells must form one connected group.
If a number appears only once in a row/column, it can never be blackened. If blackening a cell would isolate white cells, it must stay white. Circle cells you know are white — it helps with the adjacency constraint.
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.