It's a controversy surrounding the rules for the family-friendly card game UNO. Apparently, a popular maneuver is, in fact, against the rules. UNO pointed out on Twitter that you can't stack cards.

Game enthusiasts, get ready to dive into the most merciless edition of UNO yet. UNO Show 'Em No Mercy has landed in South Africa, and it's not your average card game - it's a cutthroat showdown where ...