The main game screen simulates down falling of small Ball under computer modeled gravitational force. The user can change the intensity of gravitation and some other parameters on the Control panel. When the Ball impacts a Note, it causes a sound relevant to the note. The user can change the timbre, volume and gravitational force for each track separately. Changes made to the gravitational force affect the velocity and the trajectory of Ball’s down falling. When a Ball bangs a Note on its head, the Note opens its eyes wide and makes a sound. On the Control panel the user can change pitch, volume and length of the sound assigned to each Note.