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 41–50 of 352 games matching Mystery · updated 12 Oct 2026

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$$
Released
Price
$$ · Standard
Players
👥 Up to 6 players
Reviews
81% of 1,114

From Naked Snake to Big Boss. Ten years after Operation Snake Eater. While commanding a private military force in Colombia, guests from Costa Rica visit Snake. Accepting their request, Snake leads his men into confronting the conspiracy behind the East-West Cold War.

$
Released
Price
$ · Cheap
Players
👥 Not stated
Reviews
59% of 322

Your ride is dead, and rough waters lie ahead! Survive aboard a musty boat in a totally chaotic co-op. Collect scrap, patch up leaks, swap your catch for cold brews, and use harpoons to break the laws of physics!

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$
Released
Price
$ · Cheap
Players
👥 2–100 players
Reviews
100% of 2

Two-Dye is a small indie game where you and up to 100 of your friends (or other people online) can Paint, Hide & Seek in a 2D world. Create your own maps with ease using the in-game Steam Workshop Integration that makes sharing YOUR map a smooth experience.

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$
Released
Price
$ · Cheap
Players
👥 Not stated
Reviews
16% of 6

Entity Research Group — a cooperative first-person horror game where you become part of a special unit investigating highly dangerous anomalous entities. Collect evidence and samples, complete technical objectives, and survive within the ever-changing Backrooms clusters.

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$
Released
Price
$ · Cheap
Players
👥 Not stated
Reviews
67% of 1,135

Unpredictable horrors lurk around every corner, forcing you to find the missing people while desperately clinging to survival. In this experience even your own mind can become your enemy. Stay vigilant and keep your voice hushed, or risk becoming another victim of the forest's darkness

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$
Released
Price
$ · Cheap
Players
👥 Up to 4 players
Reviews
80% of 67

A co-op horror game where you are part of a crew sheltering in a collapsed tunnel, scavenging loot across maps filled with deadly creatures born from a biological war. Feed the creature, convert its waste into fuel, and reach the radio tower

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$
Released
Price
$ · Cheap
Players
👥 2–6 players
Reviews
73% of 698

A co-op seance communications game where one of you died first, and only you can see what's killing the others. Your only voice is a Ouija board your friends keep misreading. Guide them down 9 floors of a haunted house and banish the demon before sunrise. 2-6 players. Brain required.

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$
Released
Price
$ · Cheap
Players
👥 Up to 2 players
Reviews
0% of 2

You wake in a dungeon where strangers sit in chairs, each with a story about their lover. Listen, judge, and answer. Empathize or turn hostile — every choice changes how they treat you. Find three keys and escape before time runs out. Play solo, or as a couple in two-player co-op.

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$
Released
Price
$ · Cheap
Players
👥 Not stated

Step inside. Infiltrate the manor of porcelain dolls, some are maybe your friends. Steal the key from her cold neck, find the door, and whatever you do, don’t meet her eyes. One glance is enough to lose your body. GLANCED: forget FPS shooters. Here, just a look...KILLS. Now, just survive...

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