25 Sudoku is an online number-placement puzzle that challenges logical reasoning. A 9×9 grid is divided into nine 3×3 boxes, each containing nine squares. To play, fill in the grid so that every row, column, and box contains the numbers 1 through 9, with no repetition. Begin with given numbers, strategically placing them to guide your approach. Focus on eliminating possibilities by considering existing numbers in rows, columns, and boxes. Use deduction and inference to complete the grid. Patience and persistence are key. Success is achieved when the entire grid is filled, adhering to the rules. Sudoku provides a satisfying mental workout.