Blank: Blankdemic - Rules of Play says:
Take the cards from this booster pack and add them to your copy of Blank, then get ready to save the world in a very different way! Deal with diseases, ready your roles, and make it your game... all over again! Blankdemic comes with twenty new Rules and Game Cards to add to your copy of the base game, as well as more blank Rules Cards to customize yourself. Profits from sales of the expansion also go to the designers' charity of choice, in this case Medecins sans Frontiers.