When the program starts, it should display a Game Start screen. This will have buttons for the user to choose a difficulty between easy, medium, or hard. Once the user clicks a button to select a difficulty, you will generate a Sudoku board $($more details on how to do this later$).$ The difficulty level will determine how many squares on the board are initially empty: Difficulty Number of empty cells easy $30$ medium $40$ hard $50$ Once a difficulty is chosen, your program should generate a Sudoku board, make the appropriate number of cells empty, and display the partially filled board as shown in the image below.