Civilization 5 CD Key belongs to the Civilization series and is a 4X game that has been released on September 2010 for MS Windows, 23rd November 2010 for OS X and 10th June 2014 for Steam OS / Linux. The player in this game has to lead the civilization into the future from prehistoric times using a map that is procedurally generated and has to undertake research, diplomacy, exploration, economic development, expansion, military conquest and government for achieving victory conditions. Rather than using the square tiles which were used with the earlier games, it used a new game engine having hexagonal tiles. Espionage and religion as well as several other elements has been changed or removed from Civilization IV. Even there has been overhauling of the combat system, stacked military units eliminated and cities enabled towards defending themselves by directly firing on the close enemies.
There were few expansion packs released for this installment like the first one being Gods & Kings that got released in North America on 19th June 2012 and worldwide on 22nd June 2012. The second expansion is Brave New World that got released in North America on 9th July 2013 and worldwide on 12th July 2013.