No dark corner offered sanctuary, cloaked predators disemboweled marines, and marines surrounded themselves with thickets of spider mines, and, all the while, alien players crawled through the vents. For seven years, the multiplayer servers pulsed with life. It was an asymmetrical first-person shooter that stood out when it was released in 2001. Aliens Versus Predator 2 pitted colonial marines against predators against aliens.