Each stage is memorable. Even as I write this a week after beating the campaign, I can recall dozens of “oh wow” moments, like the first time I encountered the shrieking wretches (that horrible noise they make will haunt you for days). Or when the blind, hulking berserker was stalking me by sound and smell alone. Or the part where I was defending my old home from a Locust onslaught (it felt like a smaller scale, more domesticated version of Lord of the Rings’ Battle of Helm’s Deep). Or when I looked at the face of an apartment complex, and dozens of drones were firing at me through the windows, their muzzle flashes strobe-lighting the darkness like we were on a CNN newscast, live from some war-torn third-world country. …. They all combine for an unforgettable adventure through 36 hectic, desperate hours of a group of soldiers’ lives.