This mini-expansion for Eiyo is part of the "Achievements" series of Matchbox Collection mini-expansions, and as such should only be opened and used once the 3 criteria on its envelope have been met; because of this... SPOILER ALERT: This expansion adds 5 new "Adversity" cards to the base game of Eiyo; each Adversity card changes the rules of the game for one type of enemy card, making the game more challenging.