Zynga also launched its first "hidden objects" game, called "Hidden Chronicles," in which players have to locate items buried in cluttered scenes depicting the inside of a railroad car or a Paris café. "Hidden Chronicles" will launch "soon" on Facebook, Zynga said.

The company also announced three new mobile games built with HTML 5 for Facebook's new mobile platform, announced Monday. The games are "FarmVille Express," "ZyngaPoker Mobile Web" and "Words with Friends HTML 5."

Another new mobile game, "Dream Zoo," where players collect exotic animals, will launch "soon" in the App Store, followed by the Android Market.

Zynga didn't say when the Project Z website will launch, but it will link to Facebook via Facebook Connect, and people will be able to start a game on Facebook and complete it at the Project Z site, or vice versa, said John Schappert, Zynga's chief operating officer.

It encouraged enthusiasts to -- or "zTag" -- for the new website now on Zynga's website.