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Clear:
- Sudoku is played on a 9×9 grid, divided into nine 3×3 subgrids called “regions.”
- The objective is to fill every empty cell on the grid with a number from 1 to 9.
- Each row, column, and region should contain every number from 1 to 9 exactly once.
- The puzzle starts with some numbers already filled in as “clues.”
- To solve the puzzle, you must use logical deduction and eliminate possibilities to determine the correct number for each cell.
- You cannot repeat a number in the same row, column, or region.
- As you fill in numbers, the constraints of the puzzle help narrow down the possibilities, making it easier to find the solution.