Throwing zombies into anything at the moment seems to be the correct way forward. Hell, even Treyarch threw zombies into Call of Duty: World At War, for good measure. And now, in the ever-growing expansion of the zombie game we have Left 4 Dead - quite possibly one of the finest examples of cooperative gameplay.
I don't need to say much more, so I'll let the game's packaging do it for me:
"Four survivors in an epic struggle... Fighting hordes of swarming zombies. Can you survive the ZOMBIE APOCALYPSE?
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