Sudoku challenge
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Sudoku Challenge is a digital adaptation of the classic logic-based number placement puzzle. The goal is to fill a $9 \times 9$ grid with digits so that each column, each row, and each of the nine $3 \times 3$ subgrids (also called "boxes" or "blocks") contain all of the digits from 1 to 9.
Instructions:
How to Play Sudoku ChallengeFollow these three absolute rules to complete any puzzle:The Row Rule: Each horizontal row must contain the numbers 1 through 9 without repetition.The Column Rule: Each vertical column must contain the numbers 1 through 9 without repetition.The Box Rule: Each $3 \times 3$ square (marked by thicker borders) must contain the numbers 1 through 9 without repetition.Step-by-Step Instructions:Select a Cell: Click an empty square.Input Number: Type a digit (1–9). If the game highlights the number in red, it violates one of the three rules above.Use Pencil Marks: For difficult levels, use "Note Mode" to place multiple small candidate numbers in a single cell.Elimination: Look for rows or boxes that are almost full (e.g., 7 or 8 cells filled) to easily identify the missing digits.
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