Add these special cards to a classic UNO deck (sold separately, subject to availability) and the fun begins! Each of the 16 cards in the Stack Pack acts like a Draw Card that players can stack to make other players draw more and more cards. Play a Stack 1, Stack 2, or the dreaded Wild Stack Number card and soon players will be passing out penalties like popcorn. Makes a great gift for UNO fans and card game lovers ages 7 years old and up. Colors and decorations may vary.