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Play Sudoku game online! Try to fill a 9×9 grid with numbers so that each row, column and 3×3 section contain all of the digits between 1 and 9. Can you solve the Sudoku puzzle?

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Can someone people tell me why this placement of 3 is incorrect? It's happened multiple times with other puzzles and numbers in the past and I really don't know why. Is it

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Sudoku Online - 100% Free