From their homeland in the Levant to the distant shores of Carthage, the Phoenicians made a name for themselves as master traders, seafarers, and navigators. Their fierce bireme galleys dominated the Mediterranean, with a focus on protecting their vital trade networks. They developed a new script for writing and produced jewelry, pottery, intricate glassware, and highly valuable purple fabrics. As a city state leader of Tyre, Sidon, Byblos, or Arwad, you need to assemble your fleet and establish your influence across The Great Sea.

The aim of The Great Sea is to be the first player to gain victory through conquest or commerce. Players must construct and mobilize their ships, fortify their trade routes, and research new technologies for land and sea. Key to their success will be controlling the various ancient temple sites across the map. The game ends immediately once a player's temple marker reaches the same space as either their combat or trade marker.