I never played Mario Cement, but according to Wikipedia:
In this game, the player assumes the role of Mario, working in a cement factory. The player must empty cement from the hoppers into the cement trucks below. A conveyor belt at the top moves cement into hoppers which can only hold three loads at a time. An alarm sounds when one is full. To get around one uses elevators in the center of the screen. If the player moves to the center when an elevator isn’t there Mario falls to the bottom and loses a life. Losing a life can also occur if one stays on the elevator too long, in which case Mario will either fall or get smashed.
Now that the Mario Soprano Family has taken control of the plumbing biz, they are moving into the cement business. What will be next, public sanitation? Vending Machines?