Zombies have been very much en vogue since the late 2000s. There’s something about the threat of an undead apocalypse that just grabs the imagination. It’s not just the hordes that interest people, but the act of survival. If the zombies came, people simple want to know if they would be able to survive.
Considering that an outbreak of undeath isn’t likely to happen, the next best way to test one’s skill is with games. There have been several games dedicated to zombies, from the realistic simulators to the utterly fantastical. Zombies have become a vital part of the gaming world.