ButtonMenu.java

import greenfoot.*;

public class ButtonMenu extends Actor {
    private GreenfootSound victorySound;
    private GreenfootSound gameOverSound;

    public ButtonMenu() {
        setImage("9.png");
    }

    public ButtonMenu(GreenfootSound victorySound) {
        this.victorySound = victorySound;
        setImage("9.png");
    }

    public ButtonMenu(GreenfootSound victorySound, GreenfootSound gameOverSound) {
        this.victorySound = victorySound;
        this.gameOverSound = gameOverSound;
        setImage("9.png");
    }

    public void act() {
        if (Greenfoot.mouseClicked(this)) {
            if (victorySound != null) victorySound.stop();
            if (gameOverSound != null) gameOverSound.stop();
            Greenfoot.playSound("button.mp3");
            Greenfoot.setWorld(new Menu());
        }
    }
}