Seven-ball is a game to 9-ball , the primary differences being there are only seven object balls, racked in a hexagon, and the game is won by pocketing the 7 ball. Seven-ball is racked with the 1 ball at the apex on the foot spot and the 7 ball (the money ball ) in the center of the hexagon. This game is not particularly common, and is primarily known because of ESPN's Sudden Death Seven-ball which aired in the early 2000s. Though hardly necessary, specialized equipment for the game can be purchased, including a unique black-striped seven ball and a hexagonal rack .