Sudoku Puzzle

The objective of Sudoku is to fill a 9 x 9 grid so that each column, each row, and each of the nine 3 x 3 boxes contains all of the digits from 1 to 9 exactly once. To play, select a difficulty level and enter values in the empty squares. To check a hand-entered solution, including an incomplete one, click "Check My Solution". To view the entire solution, click "Solve Sudoku". For the best results, we recommend using Firefox for this interactive case study.

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