The Binding of Isaac: Four Souls is a multi-player card game about sacrifice, betrayal and hoarding. In the game, 2-4 players take turns playing loot cards and using items to kill monsters that yield more items, loot, and sometimes souls. Cooperation, barter and betrayal is encouraged. Studio 71 products must be sold in your brick & mortar store, or through a website you own. Studio 71 products cannot be sold through third party platforms (Amazon, Ebay, etc.).