With over 100 millions players in 80 different countries, bowling is one of the most popular sports, and it is appreciated all over the world, in particular in the United States: everyone, for fun or for passion, has worn bowling shoes and faced the alley at least once in a lifetime, trying to overturn ten pins, if possible rolling just one ball. The apparently simple rules of the game (you only have to roll a ball in a precise way) persuade everyone, even the most inexperienced people, to try this sport, even if in the end the ball rolls inexorably into the gutters running down each side, without knocking down any pin.

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