:-) Sudoku

":-) Sudoku is a popular mobile game that offers a fun and interactive way to keep your brain sharp. It features three difficulty levels, intuitive interface, and various features such as pencil marks, auto-save, undo/redo, and hints. The game follows the traditional Sudoku rules, where you fill a 9x9 grid with digits without repetition in each row, column, and 3x3 sub-grid."