Captain Sonar is a loud, real-time team game. You are split into two submarine crews trying to sink each other. Each person has a specific role like captain or engineer. You have to communicate constantly while listening to the other team. It is chaotic, stressful, and highly intense. You need exactly eight players to get the full experience. Playing turn-based takes away the magic. It requires a lot of focus and energy. You will probably need a break after a single match. A highly memorable event game for a large group.