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 21–30 of 352 games matching Mystery · updated 12 Oct 2026

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$
Released
Price
$ · Cheap
Players
👥 Up to 2 players
Reviews
90% of 20

A co-op puzzle heist for two. One of you breaks into a secret bunker. The other sits in the observation office, watching the bunker. A walkie-talkie is your only link. Talk to each other and find out how good your teamwork really is.

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$
Released
Price
$ · Cheap
Players
👥 Up to 4 players
Reviews
93% of 16

Halloween is coming and a restless spirit has emptied every shelf onto the floor. Sort out the pumpkin toys, learn tricks to work faster, and bring friends in to help.

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$
Released
Price
$ · Cheap
Players
👥 Up to 4 players

An open-world survival experience that combines exploration, suspense, resource management, tactical combat, and cooperative multiplayer. Explore dangerous islands, customize weapons, survive against the Penitents and escape with friends in The Phantom Runner experience.

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$$
Released
Price
$$ · Standard
Players
👥 Up to 2 players
Reviews
100% of 1

Once Before Us is a cooperative puzzle adventure for two players - 10 chapters, 8-10 hours of co-op play. Communication and observation are the only ways forward: every riddle, mechanism, and clue requires teamwork. Together you'll explore forgotten places and uncover what came before.

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$
Released
Price
$ · Cheap
Players
👥 Up to 2 players
Reviews
100% of 1

Welcome to the ultimate battle between the Fruit and hordes of monstrous invaders. Take command as a master strategist: recruit powerful fruit warriors, equip them with devastating gear, build the ultimate team, and defeat massive bosses.

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$
Released
Price
$ · Cheap
Players
👥 1–4 players
Reviews
33% of 3

Backrooms: The Entity is a cooperative psychological horror game for 1–4 players. Deep within a distorted and decaying reality, something intelligent is hunting you. It watches, adapts, learns your behavior, and grows more aggressive the longer you survive.

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$
Released
Price
$ · Cheap
Players
👥 1–4 players
Reviews
77% of 189

You and your crew are sent in to assess reality in this 4-player co-op horror game. Memorize the environment. Spot disturbing anomalies. Decide if the timeline is safe. One bad call—and you’re forced to start over.

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Free
Released
Price
Free
Players
👥 Not stated
Reviews
60% of 15

Embark on an online 2D fantasy MMORPG featuring open-world exploration, challenging dungeons, epic boss battles, gathering, crafting, trading, professions, rare loot, player-driven progression and a persistent multiplayer world full of adventure.

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$
Released
Price
$ · Cheap
Players
👥 4–10 players

A 4-10 player online social deduction party game. Only one player knows the safe door, but that knowledge will not get them out early. Bluff and survive over live voice chat, round after round, until only two doors and two players remain.

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