Civilization III Adds Steamworks Integration

Civilization 3 survives GameSpy shutdown
Now available via Steam, the latest Civilization III replaces GameSpy with Steamworks for multiplayer functionality. The game functions identically to the previous GameSpy version with the exception that the "Direct IP" option has been removed as it is no longer supported. Save game data should not be negatively affected.
If you own a physical disc version of Civilization III and are interested in receiving this multiplayer update, you should submit a support request[].