It’s only the first half of the year, but Zynga is already making is 14th acquisition in the past 12 months, buying out DNA Games. Monetary details were not disclosed. DNA Games is known for its game Casino City on Facebook, and according to Zynga, the newly acquired developer will become its “core of a studio focused on creating new games.” It’s about time Zynga focus on new titles, since its widely popular Cityville has been its top market holder for 5 months now.

Other previous companies Zynga has acquired this year includes Area/Code and Floodgate entertainment. Zynga is the premier brand in social gaming with popular games Cityville and Farmville. It managed to rake in $544 million last year from lead generation and advertising activities, accounting for 39.1 percent share of the global market. The revenue of social network games such as Facebook come from microtransactions and operator revenues brought about by lead generation and advertising.

“During 2010 Zynga played a central role in expanding the size of the PC social networking games market, attracting millions of new users with its popular titles offered through Facebook,” said Piers Harding-Rolls, head of games for IHS.”

“Near the end of the year, the company offered a new title, CityVille, which broke records for monthly active users (MAUs). The success for CityVille had a positive impact on other Zynga games, particularly FarmVille, which achieved growth in its user base in late 2010 after experiencing steady declines during the rest of the year. Meanwhile, Zynga’s strategy continues to deliver in monetizing its offerings more aggressively through analytics-driven design and to acquire users from within its other games.”

Zynga is tailed by Electronic Arts’ Playfish and Disney’s Playdom, respectively. Zynga can be considered something of an asset for Facebook, contributing the to the skyrocketing of the social networks’ valuation $100 billion in the private marketplace. The game developer currently valued beyond $7 billion and is talks with investors to increase development funds to $250 million.