If you were happy to see the PlayStation Mini Velocity become a full-fledged game in the form of Velocity Ultra, put your hands together for developer Laughing Jackal. Those talented minds put out the Mini OMG-Z, and that’s becoming OMG HD Zombies.
The premise of OMG HD Zombies? Take a screen cluttered with the undead, shoot one of them, and cause a chain reaction that clears as many walkers as possible.
From: http://www.ign.com/articles/2013/04/12/omg-hd-zombies-announced-for-playstation-vita