The game is a cooperative third-person shooter in which four players fight against massive hordes of zombies in four locations: Moscow, New York, Jerusalem, and Tokyo. Players can choose from six classes, including Gunslinger, Hellraiser, who specializes in using explosives, Fixer, Medic, Slasher, who uses a melee weapon, and Exterminator, who specializes in crowd control. New perks and weapons can be unlocked for each of the classes as players progress in the game.The game can support up to 1000 enemies appearing on-screen simultaneously, and they can climb onto each other to reach players on a higher level. Players can collect different items in the battlefield, but their locations are procedurally generated. In addition to fighting zombies, players also need to complete different objectives, such as escorting survivors, in each location.