Zynga has announced today that CityVille will be its first social building game on Google Plus. Last month Zynga partnered with Google to bring Zynga Poker to Google+, and today the company has announced in a blog post that they are adding CityVille+ to the new game platform.

CityVille is a casual social city-building simulation game developed by Zynga, and released in December 2010. The goal is to develop a city by farming, constructing buildings, and collecting rent. The game is a freemium game, meaning there is no cost to play but players have the option of purchasing premium content.

Zynga has over 146 million users of its social games. Check out CityVille on Google+ games directory.