As mighty as it is on Facebook, social giant Zynga is still looking to make a big splash in the smartphone scene, with the firm revealing it has moved to acquire four more mobile studios.

Zynga mobile executive David Ko has confirmed to Reuters that German studio GameDoctors has been purchased, despite the firm offering a "no comment" when probed by PG.biz on a possible move just days ago. 

The makers of ZombieSmash have also been joined by American outfits Page44 Studios, HipLogic and Astro Ape Studios under Zynga's ever-growing umbrella.

Deal or no deal

Both HipLogic and Page44 work out of Zynga's hometown San Francisco, with the latter best known for its work bringing 2D Boy's World of Goo to iOS.

Ko, meanwhile, also revealed that New Yorker Astro Ape Studios had been purchased as far back as August 2011, though he declined to comment on the size of any of the deals.

Since the company went public in December its share price has been steadily falling, closing on 18 January on $8.65 per share after a six percent slide.

Wedbush Securities' Michael Pachter believes that Zynga can still come good in 2012 though, predicting a rise to $12.50 per share within a year.

[source: Reuters]