Battle swarms of hundreds of zombies - the Swarm Engine seamlessly renders hordes of zombies in incredible firefights. Advanced gore systems offer gruesomely satisfying action. Coop story-driven campaigns - survive around the world, as unique groups tell their stories of perseverance. Fight other players for survival - several intense Player vs Player vs Zombies game modes complement the coop campaigns. Grow stronger - unlock powerful weapon upgrades and level 6 character classes to take on greater challenges