Multiball mode that deals with a major point in a pinball game, by adding or intentionally subtracting balls on the field in accordance with how far the player is in completing the mode. It has to be timed as well, as one cannot exploit any potential scoring opportunities in an extensive amount of time, while giving a ball saver throughout the mode. For instance, the latest 3 Pro Pinball games (Timeshock, BRUSA, and FJ) each have at least one Progressive Multiball.
In Timeshock Frenzy, the mode starts with 5 balls in play, and reduces by 1 for each time a ball is re-locked into the Crystal. The same goes for Big Race USA, except the amount of balls in play can fluctuate throughout the Big Race in accordance with race position. Fantastic Journey subverts this; there is one ball in play for each Contraption activated during the Island Adventure.