Congratulate


4 5
4 1 9
5 6 7
4 3 9
2
2 6 8
8 9 1
7 8 6
6 4 5

VERY EASY    EASY    MODERATE    HARD    NIGHTMARE   
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How to play SUDOKU
The idea of Sudoku is to fill a 9x9 grid with numbers so that each row, each column, and each of the nine 3x3 sub-grids contains all of the numbers from 1 to 9.
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