In Underwater Cities, which takes about 30-45 minutes per player, players represent the most powerful brains in the world, brains nominated due to the overpopulation of Earth to establish the best and most livable underwater areas possible.

The main principle of the game is card placement. Three colored cards are placed along the edge of the main board into 3 x 5 slots, which are also colored. Ideally players can place cards into slots of the same color. Then they can take both actions and advantages: the action depicted in the slot on the main board and also the advantage of the car ...