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The name "Sudoku" is derived from the Japanese words "su" (number) and "doku" (single), indicating that each row, column, and 3x3 grid must contain unique numbers from 1 to 9. sudoku premiumvery simple sudoku The objective is to fill the grid with numbers from 1 to 9, ensuring that each number appears only once in each row, column, and 3x3 subgrid.