I have be a avid fan of the previous four civilization game and be very shock to find in order just to install Civ 5 I need to subscribe to the service of steam . I have dealings with this company once before and find they gaming service do not always work and get in touch with they support be next to impossible . the game description say `` initial installation require one-time internet connection for Steam authentication '' but even after authentication it require Steam to load so by `` one-time '' I guess it mean once every time you try to play the game . I be return the game now .