Verkkoto complete the sudoku puzzle, enter numbers into the spaces so that each row, column and 3×3 box contains the digits 1 to 9 without repeats.

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Enter digits from 1 to 9 into the blank spaces.

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Four levels from easy to evil.

Some tips for solving.

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Some tips for solving.

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Every row must contain one of each digit.

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Verkkoto complete the sudoku puzzle, enter numbers into the spaces so that each row, column and 3×3 box contains the digits 1 to 9 without repeats.