Sudokuisalogic-based,combinatorialnumber-placementpuzzle.
Theobjectiveistofilla9×9gridwithdigitssothateachcolumn,eachrow,andeachofthenine3×3sub-gridsthatcomposethegrid(alsocalled“boxes”,“blocks”,“regions”,or“sub-squares”)containsallofthedigitsfrom1to9.
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