The Clock Tower Factory is the world that holds Expert stages 11-19 in Super Monkey Ball 2 and holds Expert Stages 71-79 in Super Monkey Ball DX. It also holds advanced stages 46-49 in Super Monkey Ball Deluxe.
This level is extremely hard. When you reach this world, you face stages that seem to be very tough and confusing. This is said to be one of the most toughest worlds in the game as levels gets harder than ever.