The King's dimensional orb has malfunctioned, bringing hordes of monsters into the Kingdom. Defend your safeground against the monsters by gathering resources, building defenses, upgrading your arsenal, and surviving long enough to find the source of monsters and destroy it.
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No game lists Monster Outbreak as one of its co-op favourites yet, so here are the closest matches by Steam tags instead.
In this top-down, multiplayer, co-op game, you must protect your Core Crystal by any means necessary. Build up your defenses, explore, refine, and upgrade to reach your goal. Play alone or with up to 8 people.
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Citywars TD is a cute multiplayer third person Survival Tower Defense. Build towers, gather resources, craft tools, upgrade weapons, level up buildings, expand your city with your friends and work under pressure before the next incoming wave of monsters.
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Build your base on a moving Machine, travel through biomes with different resources, and prepare for the night when a zombie threat is much higher than during the day. Would you go solo or explore this new world with your best friends?
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The Riftbreaker is a solo or Co-op base-building, survival game with Action-RPG elements for up to 4 players. Hack & slash countless hordes of enemies. Build up your base, craft powerful weapons and research new inventions to survive.
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Embark on an unpredictable survival journey in Start Over. Solo, co-op, online, explore diverse landscapes, craft through 4 tech tiers, encounter wildlife, and trade or raid for resources. Choose your path, defend against waves, and shape your destiny in a dynamic world. Are you ready to Start Over?
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Crash land on a hostile planet where you'll have to build the strongest defenses if you wish to live to escape from it. But be warned... this planet is merciless. Build strong, and smart; else physics may flood or destroy your only hopes of survival.
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Welcome to SoupCo, Astroworker! In Nom Nom Galaxy, construct and automate gigantic soup factories on unexplored planets throughout the universe, harvest flora and fauna to turn them into artisanal soups, and rocket your product into the gullets of the galaxy!
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Dive into the dynamic world of "ChatTDT: Tower Defense Twitch," where your Twitch chat becomes an integral part of the action! Designed to seamlessly integrate with the Twitch API, ChatTDT offers a unique and interactive tower defense experience that engages both streamers and viewers.
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Experience a vast Sci-fi open-world survival TD game set on a distant planet deep in the universe. Craft, build, mine, trade, explore, and survive in this alien world. Collect Data and defend against waves of enemies seeking to banish you. Enjoy the adventure in Singleplayer or Multiplayer.
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Brace yourself for a brand new action-packed Open World. Explore a huge world to gather materials for gear and defenses. Use everything at your disposal to defend your bases and defeat hordes of hostile monsters. Play solo or up to 8-player online!
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