Replace three cubes from original rory39s story cubes with one of the new mix sets swapping a few images will totally transform the theme of the stories you tell it39s just like adding spice to a mealr r the prehistoria set allows you to weave tales of primeval predators and time travel back to long forgotten erasr r one of the first three sets in the series is rory39s story cubes quotprehistoriaquot simply mix up these three dice wiht other rory39s story cubes to weave