Throbax TD is the "Tower Defense" game you are looking for: Help Ughlar fight his way through 50 levels, buy over 100 upgrades and get all of the 50+ achievements.
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No game lists Throbax TD as one of its co-op favourites yet, so here are the closest matches by Steam tags instead.
我们想打造一种很不一样的塔防游戏， 它应该很紧张，很刺激，除了策略， 还应该有英雄操控，玩起来更像我们过去玩的魔兽RPG, 潮水一样无数的怪，还能多人合作。 对了！ 玩家之间还要能够公平竞技来一场PK, 这种PK要比MOBA游戏轻度一点， 可以1对1。于是有了现在的《策马守天关》！！！欢迎来体验！
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TOWER ▪ DEFENSE ▪ STRATEGY. Control Vessels. Utilize their uniquely deep set of towers. Create an everchanging defense. Play with friends. Protect your Basin at all costs. An absolute Tower Defense, Real-Time Strategy Hybrid
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Catnip Wars is a 1–4 player co-op tower defense. Play as scrappy Catbots defending your catnip farm from monster waves — build and power turrets, raise walls, harvest resources, man the BFG, revive fallen friends, and climb the tech tree. Play solo or online with friends. Achievements/Leaderboard
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Sky Fleet is an online co-op action RTS. Work together to build a base and defend it from attacking drones. Mine resources to upgrade your ship and destroy the drone's base.
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Defend this colorful world with a brilliant strategy! Strengthen your battlefield and don't let enemies reach their destination. Make amazing combinations, and choose the most powerful elements wisely!
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BioFusion is a VR co-op multiplayer, PvE, first-person-shooter, tower defense game. Swing on a grappling hook, ride a hovercraft, throw grenades, collect buffs, build towers and traps. Do what you must to keep the mutants from the Spores of Evolution.
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Employ lethal turrets, traps, and gadgets to defend against an onslaught of evolving creeps! Step into a twisted, hyper 3D, mind bending realm. Upgrade and adapt your defenses. Become a master maze crafter. Collect bizarre artifacts. Rush creeps for lucrative rewards, and succumb to greed!
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A real-time fantasy tower defense where adjacency matters. Master 12 magic schools, blend them through 66 unique synergies, and defend across 21 distinct maps. 144 tower variants, deep upgrade trees, endless wave escalation. Play solo or in online co-op.
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Tower Defense meets magical action. Fire cat cannons. Build, repair, and upgrade your defenses. Master multiple mage classes. Mage Fort puts the focus on co-op action with a heavy defensive theme!
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