Knock Knock is "a fast-paced, competitive game for friends and future enemies." In this card game players compete to be the first to get rid of their hands. Like other card shedding games, play proceeds as players discard matching the suite or value of the previously discarded card. However, players with a matching card may "cut in" out of turn skipping other players and moving closer to victory. Various special cards also add fun and silly elements such a slapping, silence and moose antlers.