When looking at Call of Duty Zombies, it is always surprising that a military FPS spawned such a mode. Treyarch’s co-op survival experience is filled with unique features like perk-a-colas and Wonder Weapons to match unique locations like a medieval castle and an alternate version of Stalingrad overrun by dragons. CoD Zombies offers a strong story to boot, and that narrative is extended through its Easter egg songs - a trick that is also used by Alan Wake 2.