Civ3 is the best of the Civ series. It differentiates its units by separate Attack and Defense values, allowing truly distinct unit and unit actions. It's the first in the series to use borders that grow intrinsically. From a solid tech tree to the single best editor in this or any game series, Civ3 stands out. It's easy to truly get lost in the "one more turn" dynamic. Fantastic and to-date unrivalled.