You might be wondering what Plants vs. Zombies, the tower defense game from PopCap Games, is doing here. With its silly sense of humor and cartoonish art style, PvZ isn’t much of a horror game. It will never fill you with existential dread. It will never gross you out with extreme gore or fill you with that same kind of visceral feeling that you get facing a freakish monster in Dead Space or Resident Evil. It won’t do any of the things that good horror games ever do. It is, however, extraordinarily addicting. And once you get started, it is scary how much time you will want to sink into it.