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Step 3: Fill in the Given Numbers Begin by filling in the numbers that are already given in the puzzle. free sudoku online easyintermediate sudoku puzzles Understanding the Rules: Sudoku is a 9x9 grid divided into nine 3x3 subgrids called "boxes" or "blocks." The objective is to fill the grid with digits so that each column, each row, and each of the nine 3x3 subgrids contain all of the digits from 1 to 9.
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