Unstable Isotope is a micro party game. Each player gets a subset of the cards that represent an unstable isotope that is about to become stable by kicking something out of it. If you are going to get ejected out of the isotope, you can save yourself by correcting finding a different subatomic particle to eject in someone else's hand. If you get ejected, you are out until the next round. Knocking someone out scores you subatomic particles. The first one to collect a whole set wins!