SAN FRANCISCO –  Zynga is expected to unveil its playbook at its second "Unleashed" event Tuesday, including a line-up of games that will be released over the next several months.

The event will be hosted by the company's CEO Mark Pincus at its swanky San Francisco headquarters. As usual, the canine-friendly company has invited both the press and their furry friends to attend.

But the social game-maker has been fairly tight-lipped about what it will be announcing.

Last week, it sent reporters red boxes, consisting of only an invitation folded into the shape of an paper airplane. The message was cryptic, but it appears that the company is hoping for its next set of products to really take off.

Indeed, Zynga -- which is known for social game hits on Facebook, like FarmVille, CityVille and Words with Friends -- is probably looking for a catalyst. The company's stock traded higher Monday based on buzz ahead of the event, but it is still down 40 percent since its December initial public offering (IPO).