Today Firaxis has announced the release date of the demo game of Civilization V - it's September 21st, the date of the release for North America. More info here:

Sid Meier’s Civilization Official Site | 2K Games
http://www.civilization5.com/#/community/demo_release_date
Since 1991, the award-winning Civilization series of turn-based strategy games has challenged players to build an empire to stand the test of time.


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