Description from the rulebook: QCD is a game based on the rules of how quarks combine to form particles of matter and anti-matter... A QCD deck contains 24 quark cards and 24 anti-quark cards" The deck has 6 suits with each card having a negative counterpart. There are multiple games that can be played with the deck. Listed in the rulebook are "Quark Rummy", "Disintegration", and "Annihilation"