San Francisco-based Zynga said it had bought four mobile gaming companies for an undiclosed sum.
Zynga senior vice-president David Ko announced about these acquisitions by the company, known for developing popular Facebook games like Farmville.
Zynga bought Astro Ape Studios in August to develop new titles and German company Gamedoctors of the ‘ZombieSmash’ fame in December.
Earlier in September, it bought Page44 Studios, which develops ‘World of Goo’ game for iOS platform, and it acquired Hiplogic into the same business in August last year.
Other popular Zynga game titles include CastleVille, Indiana Jones, among others.
In addition to its presence on Facebook, Zynga is trying to expand its share in the mobile segment following the likes of Electronics Art and Gameloft.
Zynga, which went public last month, has reportedly raised a billion dollars with long-term investments.