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How to play Sudoku online? Goal is fill in the numbers 1-9 exactly once in every row, column, and 3×3 region. Use the numbers from 1 to 9. Each square contains a number only once. Each 3×3 box contains the numbers from 1-9 only once. Each vertical column contains the numbers from 1 to 9 once. Each horizontal row contains the numbers from 1 to 9 once.
