Cult of the Lamb has introduced a local co-op mode through the Unholy Alliance update, allowing players to summon a new character, The Goat, for shared gameplay. The game combines village management and combat, where players control The Lamb and gather followers while embarking on crusades against the Bishops of the Old Faith. Co-op play enables both characters to traverse the environment together on a shared screen, with the ability to revive each other during battles. New tarot cards, relics, and fleeces are unlocked with a co-op player, and players can also start a new game together. The shared screen may cause interruptions when managing the cult, but effective communication can enhance the experience. The cooperative mode offers a new way to explore the game, particularly for post-game quests and harder challenges.