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25:11
YouTube
Cracking The Cryptic
A Sudoku With Only 4 Given Digits?!
You can try this quite remarkable construction by Aad van de Wetering here: https://cracking-the-cryptic.web.app/sudoku/2QM8JHJ4HB Normal sudoku rules apply. In addition, both marked diagonals must also contain the digits 1 to 9. Cells that are a knight's move apart (in chess) cannot contain the same digit. The central 3x3 box must form a magic ...
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