“Captain Sonar” is a team game offering real-time underwater battles: two submarine crews are on a mission to locate the enemy and blow them out of the water. The most important thing a team needs is quick and focussed communication. Each crew has four roles: the captain announces the course and decides whether to lay a mine or to send out a drone. But is that such a good idea right now? The radio operator is listening to the enemy captain’s course directions and is trying to locate their boat’s position. Any of the ship’s systems – such as the torpedoes – can only be deployed once the First Mate confirms they are ready. The Engineer ensures that any breakdowns won’t mean the submarine has to surface. All in all, it’s a nerve-wracking experience. There is also a turn-based introductory mode for first-time cadets.