the binding of isaac: four souls gold box edition - kickstarter exclusive edmund mcmillen the official binding of isaac multiplayer card game, about sacrifice, betrayal and hoarding. 2-4 players take turns playing loot cards and using items to kill monsters that yield more items, loot, and sometimes souls. the first player to end their turn with 4 souls is the winner. cooperation, barter, and betrayal is encouraged. —description from the publisher