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 61–70 of 352 games matching Mystery · updated 12 Oct 2026

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$
Released
Price
$ · Cheap
Players
👥 Up to 8 players
Reviews
50% of 2

Explore a shifting haunted house alone or with friends in online co-op. Watch every room carefully, uncover disturbing anomalies, and question what is real as the house grows stranger with every new discovery.

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$
Released
Price
$ · Cheap
Players
👥 Up to 12 players
Reviews
97% of 49

NOW WITH PUBLIC LOBBIES! Blend into the environment and eat objects around you as a sneaky Mimic, or burn, zap, and explode everything as a crafty Exterminator to root out the Mimics in this Prop-Hunt inspired multiplayer game of chaos and frenetic fun!

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$
Released
Price
$ · Cheap
Players
👥 Up to 3 players
Reviews
88% of 11,042

An online co-op detective horror for up to 3 players. Work together across randomly generated shifts to investigate your customers, as some are only pretending to be human. Make one mistake, and you’ll be forced to board up, set traps, and hide.

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$
Released
Price
$ · Cheap
Players
👥 1–4 players
Reviews
84% of 13

Gather animals, craft equipment from collected resources, and face the strange creatures lurking beyond the fog together in this 1-4 player co-op exploration and adventure game.

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$
Released
Price
$ · Cheap
Players
👥 Not stated
Reviews
33% of 3

Late Night Fears includes 3 horror experiences, 3 different nightmares. Play every map in Singleplayer or Local Split-Screen Co-op, with Steam Online Co-op available on one map. Work in the grocery store, cook at a creepy kiosk, or survive a bus ride full of anomalies.

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Free
Released
Price
Free
Players
👥 Not stated
Reviews
80% of 121

Officially licensed by Nan Pai San Shu, this authentic tomb-raiding MMO brings the novel’s world to life. Venture into the Seven-Star Lu Palace, Nine-Headed Cypress, Bronze Gate and more—iconic locations recreated in stunning detail.

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$
Released
Price
$ · Cheap
Players
👥 Not stated
Reviews
93% of 64

Step into a fully 3D medieval world of deception. diffiCULT is a multiplayer social deduction game where you must uncover hidden cultists. Use proximity voice chat, investigate houses at night, survive daily votes, and reveal who is truly on your side.

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$
Released
Price
$ · Cheap
Players
👥 Not stated
Reviews
100% of 13

Mine ore on the Moon, send it back to Earth to earn money, and buy Skill Cores to upgrade your abilities. Use a variety of helpful equipment on your expedition — and yes, there’s a dog! Uncover the secrets hidden beneath the lunar surface.

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$
Released
Price
$ · Cheap
Players
👥 Up to 4 players
Reviews
0% of 2

BugFixer is a 4-player co-op horror social deduction game where you must collect the bugs occurring in reality. As a specialized agent, your mission is to collect these bugs and survive until the end against both mysterious monsters and a hidden traitor among your teammates.

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$
Released
Price
$ · Cheap
Players
👥 4–11 players
Reviews
100% of 2

A multiplayer social deduction and investigation game where players gather clues, debate, and manipulate trust to resolve a mystery; with no elimination until the big finale.

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