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These complexities were taken to the next level with Civilization, in which the separate economies of each city affect the whole empire, as do resources, geography, and most importantly, the computer opponents. It is a game that is extremely broad, where combat is only one of the options for victory, along with diplomacy and a space race. Unlike other strategy games, it also spans the whole history of humankind, from the founding of the first cities to the present day, each age with its particular technologies, units, and buildings. This breadth makes the possibilities within the game enormous, and gives Civilization a tremendous amount of replayability in a way that is both interesting and addictive, causing players to declare that they will play "just one more turn," and end up playing for hours longer than they intended.