The object is to carom off both object balls with at least three rail cushions being contacted before the contact of the cue ball with the second object ball .
In three-cushion billiards , sometimes called three-cushion carom , three-cushion , three-cushions , three-rail , rails and the angle game , the object is to carom off both object balls with at least three rails being contacted before the contact of the cue ball with the second object ball .