"Fortress of the Undead" is an intense zombie survival game. Scavenge for weapons and ammo, fight off hundreds or thousands of zombies with up to 4 players, and try to survive as long as possible.
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No game lists Fortress of the Undead as one of its co-op favourites yet, so here are the closest matches by Steam tags instead.
Shoot,Kill,Buy,Adapt,Keep going and Win. Zomb'Invasion is an FPS multiplayer wave zombie shooter game where you need to defeat a countless number of zombies in chaotic conditions!
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Take on a city overrun by zombies with 1 to 4 players online — co-op or PvP! Hold the line against running, leaping, spitting hordes. Fight by day, hunt in the dark of night. Tear off limbs and unlock cosmetics with every kill. Stand together... or hunt each other down.
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L.O.S.T. is a 4-player co-op survival game. Work together, scavenge resources, and do whatever it takes to escape before it’s too late.
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A Single and cooperative game for 4 players, you are a fighter of a special purpose unit, your task is to destroy waves of zombies by taking convenient positions and using tactic
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Dead On Duty brings the golden era of wave-based zombie shooters to PC with a focus on fast-paced gunplay, tactical progression, and intense cooperative action. Whether you're a lone wolf or a squad leader, every round is a test of your reflexes and resource management.
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Resurrection is a wave-based indie FPS by Bad Dev Studios. Fight endless, aggressive zombie hordes in a burning city. spend points at the random weapon box for better firearms, manage your ammo, and use precision sniping to survive increasingly difficult waves.
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A co-op PvE survival game where you team up with other survivors to scavenge resources, fight infected enemies, uncover the map, and reach the final extraction point.
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Dead Rush is an FPS arcade shooter that combines fast-paced action, stylized visuals, and relentless waves of zombies. Choose your weapon, fight with friends, and see how long you can survive.
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A world where the living envy the dead. Cities are plunged into darkness, the world into silence. You are part of the extraction team, but this time you are trying to save not just people, but humanity itself. Gear up, trust your comrades, and dive into the darkness to save humanity!
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A fast-paced, wave-based zombie shooter set in an alternate 1980s dystopia. Call in airstrikes, deploy support bots, upgrade wild weapons, and survive the horde—solo or with friends. No grinding. No paid DLC. Just pure, chaotic fun.
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