Kill Strain, a top-down free-to-play twin-stick shooter for the PlayStation 4 from Sony San Diego, launched today. You wouldn’t know it, unless you went looking for it. First revealed in December 2014, the first-party title is being released in a low-key fashion. It’s not even noted on the front page of the PlayStation Blog. The game has an asymmetrical multiplayer setup, which may contribute to it being hard to market. It’s two teams of four humans versus each other and a team of two mutants. Sony San Diego previously worked on the MLB: The Show games, Mark of Kri, and they also created Drawn to Death, another free-to-play shooter for PlayStation 4.