Supersonic, not one of the most popular Bally machines of the era. We played one at a Campsie fruit shop back in 1981 every afternoon before work. I was at uni and had a casual night job at a supermarket. The machine we played was so worn that most of the playfield was not recognisable. The rest of the machine was good and strong and we knew the game rules, we had one leg propped with cardboard to get the right tilt for the top centre lane. Great challenge and play, the only negative was the slow wait for bonus accumulation at the end of each ball - typical of Ballys of the time.