Please update your scenarios not so often. I can't any new notifications because all 8 places for new norifications are occupied by"Moon patrol by Game/maniac has been updated".

You shouldn't put the command to play the music into the constructor. If you make a variable GreenfootSound music = new GreenfootSound("name of you music"); and when you write int the act method of your world: if(!music.isPlaying()) music.play(); the music will be played again, after it is finished and it will play, when you press the Run button, not when it is loaded.