With Left 4 Dead 3 seemingly never happening, here are four other co-op shooters that'll satisfy your craving.

Zombies is back, and there's a ton of equipment and augments to unlock, provided that you're willing to work for it.

But all of this is presented in 3D, with dynamic seasons and highly perceptive undead. Even with a billion zombie survival games out there, you can see why fans of the genre might find Vein appealing.