Online co-op Mystery games

Every online co-op Mystery game on Steam we know of, newest first. Add tags or a price band to narrow it down.

Showing 221–230 of 352 games matching Mystery · updated 12 Oct 2026

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Free
Released
Price
Free
Players
👥 4–16 players
Reviews
69% of 71

Impostor Online is a 4–16 player social deduction game of murder, lies, and paranoia. Every match you're dealt a secret role: investigate, heal, deceive—or kill. Someone at the table wants you dead. Find them first, or make sure they never find you.

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$
Released
Price
$ · Cheap
Players
👥 Up to 4 players
Reviews
66% of 3

Deep Dark Space is a Phasmophobia-like 4-player online co-op horror experience set in space. Explore abandoned stations, gather clues, and uncover the monster lurking in the dark. Trust no one — paranoia runs high as hidden betrayals threaten your survival.

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Free
Released
Price
Free
Players
👥 2–4 players
Reviews
49% of 857

Welcome to Dustown is a single-player or cooperative horror game for up to 4 players. Play as field scientists exploring vast labyrinthine cornfields, collecting samples and evidence for a mysterious corporation. Make sure you don't get killed at the crossroads.

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Free
Released
Price
Free
Players
👥 Up to 4 players
Reviews
86% of 92

You are hunted by a rogue computer program. Avoid the bot either by yourself or cooperate with others while attempting to collect electrical components around the world to activate beacons to open the escape hatch.

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$$
Released
Price
$$ · Standard
Players
👥 3–6 players
Reviews
50% of 4

NMO is a thrilling multiplayer (3 to 6 players) game where one player, the impostor (Ox), lurks in the shadows to deceive and neutralize the Operators, while others take on the role of Operators, working independently or cooperatively to identify and eliminate the Ox hidden among them.

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$$
Released
Price
$$ · Standard
Players
👥 Not stated
Reviews
100% of 3

Dive into an intense psychological horror experience with Smile, You’re Being Filmed: Together, the multiplayer version of the game where observation and cooperation are your greatest assets.

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$
Released
Price
$ · Cheap
Players
👥 1–2 players
Reviews
73% of 15

Anomaly Living is a cooperative horror game for 1-2 players. Only you can help find Leia in this world filled with monsters and anomaly phenomena. Good luck!

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$$
Released
Price
$$ · Standard
Players
👥 1–6 players
Reviews
93% of 1,221

The Other Side is a co-op psychological thriller for up to 6 players. Your goal is to investigate haunted locations using modern ghost hunting equipment, gather evidence, identify entities, and cleanse them from the location. Customize your character, headquarters, and more.

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$
Released
Price
$ · Cheap
Players
👥 Not stated
Reviews
0% of 4

Alchemists is a Co-Op horror game that can be played with at least a minimum of 1 and a maximum of 4 players. Your goal is to expel the evil spirit from cursed places by completing the 4 Element ritual. Destroy the monster alone or with your team using your tools.

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$
Released
Price
$ · Cheap
Players
👥 Not stated
Reviews
0% of 1

The Maze Project is a psychological horror game set in a dark, creepy maze. Unaware of how you found yourself here, you must escape from this twisted nightmare. Survive from the dark manifestations that lurk around the maze waiting for every opportunity to get you, and uncover the hidden secrets.

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