Hidden Deep is an atmospheric sci-fi action game heavily inspired by Aliens, The Thing, and Half-Life. Explore, climb, swim, scan, blast and shoot your way through dangerous missions in a huge sub oceanic mining and research facility. Fear the horrors that lurk below…
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No game lists Hidden Deep as one of its co-op favourites yet, so here are the closest matches by Steam tags instead.
Punch out or get punched! Unemployed Nightmare Together is a 1–4 player co-op horror where you're trapped inside a nightmare office by a relentless job application. Restore power, complete your paperwork, and reach the elevator before you're drained. Quitting is not an option.
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DIG Raiders is a co-op game about blasting underground in search of aliens. Deep in debt, you've taken on a mysterious dig site. Team up, blow a path below, explore, find aliens, and put them to work in your alien shopping district—or ditch the job and start an all-out brawl with your friends!
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UFOBIA is a cooperative horror game for 1 to 4 players who need to solve puzzles and face beings from another planet.
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Sewer Raiders is a horror exploration puzzle game where players descend into massive underground tunnels, solve puzzles, scavenge loot, and flood the infested sewer. Every run is unpredictable, hidden paths, and dangers lurking in the dark.
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Psychoscopy is a 5 player co-op horror game that you try to gather evidences about paranormal activities in large areas. Make a team with your 4 friends, take your equipments and hunt down paranormal activities.
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A survival horror set in a massive maze. Play solo or 6-player co-op. Scavenge resources to craft gear and survive against terrifying enemies. Unlock unique abilities and find the exit.
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They See Us is a multiplayer horror game built for creepy vibes, scream-worthy jump scares and hilarious co-op tension. Work together to spot terrifying anomalies lurking in familiar places – before they find you!
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Gather your courage and face the ghost danger.Clean the curses and hunt the ghost!
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Behind the Backrooms is a 1-4 player co-op horror exploration game
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Enigma Manor is a 1-4 player co-op survival horror game. Navigate your way through the procedurally generated manor, fend off monsters, solve puzzles and find a way to escape.
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