void Update()
    {
        levelavailable = PlayerPrefs.GetInt("LevelAvailable" + Worldname);
        for (int i = 0; i < levelavailable; i++)
        {
            if (!PlayerPrefs.HasKey(i.ToString() + Worldname))
            {
                PlayerPrefs.SetInt(i.ToString() + Worldname, 0);
            }
        }

        for (int k = 0; k < levelavailable; k++)
        {
            stars = PlayerPrefs.GetInt(k.ToString() + Worldname);
            starscontroller.ActivateStars(k, stars);
        }
    }