Plot: Sid Meier's Civilization V is a 4X video game in the Civilization series developed by Firaxis Games. The game was released on Microsoft Windows in September 2010, on OS X on November 23, 2010, and on Linux on June 10, 2014. Wikipedia
Plot: Europa Universalis IV is a grand strategy video game in the Europa Universalis series, developed by Paradox Development Studio and published by Paradox Interactive. The game was released on 13 August 2013. Wikipedia
Plot: Sid Meier's Civilization VI is a turn-based strategy 4X video game developed by Firaxis Games, published by 2K Games, and distributed by Take-Two Interactive. Wikipedia