Civilization 5 was a landmark release for the series, expanding on the series' patented gameplay in many ways and giving players a wealth of paths they could embark on to attain victory. The game's focus on strategy is quite intense without being too overbearing, making it quite accessible at lower difficulties before players decide to up the ante. There aren't many 4X strategy games that are accessible to beginners, making it clear why Civilization has such a loyal fanbase that loves every title in this illustrious series.