Farmville 2 builds on the original real-time farming simulation adding "3D graphics" which allow players to view the world from different angles. Users cannot carry over items from the original game, adding an incentive to buy virtual goods to speed up progress.

Investors will hope it proves popular. The firm's stock has traded below its flotation price since April because of fears of waning interest in its titles.

Some analysts have pointed to Facebook users shifting to mobile devices. Although Zynga offers "express" versions of some of its games via the mobile Facebook app, these have not proved popular.

It has acted to counter this trend by offering a selection of titles as separate app downloads, although it has not announced plans to do this with Farmville 2.