Inspired by "The Russian Sleep Experiment," this co-op multiplayer horror game challenges players to collect crucial evidence from past experiments. Work together to control the gas, evade the roaming monster, and uncover the terrifying truth.
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No game lists Sleepless as one of its co-op favourites yet, so here are the closest matches by Steam tags instead.
Search an abandoned Appalachian forest, complete objectives, and escape before midnight. Survive alone against a deceptive hunter or enter 3–5 player multiplayer, where one of your friends can become the Wendigo and hide among the group.
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Ghostbane, is a Co-Op horror game for 1-4 players. Detect paranormal activity, collect evidence of ghosts, hunt ghosts by rituals, and conduct detailed investigations about ghosts in your main base.
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Sinever: The First Seal is a 1–4 player co-op psychological horror game. Explore an isolated Victorian estate, operate paranormal equipment, manage your sanity, and uncover the truth behind its imprisoned entity before the house claims you too.
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Co-op horror for 1 to 6 players. Anyone can try to escape the Backrooms. You are going back in: locate the lost agents, solve the puzzles, film the entities, and hold out until extraction. Everything you carry can be lost. Your ranks, gear and storage are built to last.
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Toy Scrappers is a thrilling chase-based horror game that can be played with up to 16 players. Some players take on the role of a killer attempting to capture others. Escape the madness and stay alive!
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A psychological horror game that centers on exploration, puzzle-solving, and terrifying entity encounters
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"The Backrooms: Last Expedition" is a cooperative horror game designed for 1 to 4 players. Its main objective is to create an enjoyable gaming experience for friends. Players will navigate through terrifying levels, filled with various entities and dangers, as they strive to escape.
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Necrophoresis is a co-op horror game for 1-4 players. Explore a haunted morgue to find its dark secrets. Use what you can find to make your way through the morgue and find your way out.
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Daemonium is a 1-4 player online co-op psychological horror game. Demonic possessions are running rampant. Grab your equipment, join your team, and locate the source of the demonic presence. Enter the portal to the demon realm and perform an exorcism to banish the demon to hell.
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Escape atmospheric solo and co-op horror scenarios while being hunted by unnatural entities.
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