Putrefaction is a First Person Shooter with horror elements, lots of enemies and weapons. The game heavily inspired by old-school shooters from 3D Realms and id Software.
In the near feature the new disease started to infect people. The infected experienced horrifying body transformations, making them unable to even walk or talk normally. In response to this threat a special elite force was created, with the task of finding a source of this horrible epidemic and eliminating it. You are playing as a member of this organization, send to check an abandoned base in mountains. From there you must find an underground facility and uncover horrible truth about what's really happening.