In order to win the car, the contestant must roll an image of a car on all five dice. The contestant moves behind the dice table, and the five dice are placed in a container which the contestant dumps down a ramp onto the table surface. If the contestant has won additional rolls, they may return all dice which show cash to the container and roll them again, or they may elect to stop and accept whatever cash is showing on the dice. If they haven't won the car on their final roll, they still win the cash showing on the dice. Contestants will win at least $500 if they do not win the car. Contestants are not allowed to keep cash dice and re-roll dice showing cars.
The theoretical probability of rolling a car on one die is 1 in 2 (50%); in two rolls of the same die, it is 3 in 4 (75%); and in three rolls, it is 7 in 8 (87.5%). The theoretical probability of rolling five cars in one roll of the dice is 1 in 32 (3.125%).
Let 'em Roll was created by then-host Bob Barker.
In May 2003, Let 'em Roll's original table was replaced by a much larger one with a much longer ramp. This larger set had previously been on a $1,000,000 Spectacular weeks before it made its daytime debut. A Plexiglas barrier was added around the table on March 9, 2005 to combat a recurring problem of dice flying onto the floor.
The dice were originally made of Styrofoam, but were not durable enough. The dice were later remade out of wood.
Most foreign versions of the show model their Let 'em Roll props on the game's original set. While the game is usually played for cars, it is sometimes played for other prizes on Portugal's O Preço Certo em Euros.