In the past few decades, zombies have become increasingly widespread subject material for video games. To date there are well over 100 video games that feature zombies, the majority of which are first-person shooters (FPS). Although they often serve as the main antagonists in many popular video games, such as in the recent DayZ and The Last of Us, they have also begun to gain popularity as antagonist replacements in originally zombie free games via DLC (downloadable content), mods (modifications), expansion packs, and the like.