Google Plus' casual gaming cabinet may not be as fully stocked as the Facebook alternative, but one crucial missing piece of the puzzle has just been filled in: Megalithic social monolith Zynga has ported CityVille, their most popular Facebook game, to Google's fledgling platform.

The release comes shortly after the end of Google Plus' closed beta, and now that its e-doors are open to the public, we doubt this will be the end of Zynga's extra-Facebook expansion. Seeing as the company just posted a 95 percent drop in profit year over year, developing its products beyond its existing user base is a shrewd move.

This article was originally published on Joystiq.