“FarmVille” became a household name when it launched in 2009 and helped propel Zynga to the forefront of Facebook game makers. But now Zynga’s stock is down some 70 percent since its December initial public offering.

So a lot is riding on “FarmVille 2,” which Zynga released yesterday.

It’s a total makeover for the simplistic, addictive, but oft-derided online diversion. It now has lush 3-D graphics instead of the old two-dimensional figures.

Zynga stock closed at $2.92, up 3.2 percent.