Online co-op Investigation games

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

Showing 11–20 of 178 games matching Investigation · updated 12 Oct 2026

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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
👥 Up to 4 players
Reviews
57% of 7

A tense investigative horror experience for solo or up to 4-player co-op, where you search for clues in the dark to uncover the truth behind a spirit’s death before something else finds you first.

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$
Released
Price
$ · Cheap
Players
👥 Not stated
Reviews
47% of 19

A challenge for one to three participants. Survive five nights, craft your build, and scan Creatures with EyeAI. Reach #1 to claim €100,000 and become a JunkTok legend!

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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
👥 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
👥 2–7 players
Reviews
0% of 1

FILENDS is a dark multiplayer riddle-solving game for 2-7 players. Work together to solve levels filled with murder mysteries and tragic tales. Use environmental clues and real-time chat to uncover the truth. Will you solve the riddles or become a part of them?

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$
Released
Price
$ · Cheap
Players
👥 5–8 players
Reviews
94% of 151

Deadly Trick is a social deduction game playable with up to 8 players. Survive the death game unfolding at school under the name "Special Class." Depending on the situation or your own choices, you could become the White or the Shadow! Cooperate… or betray.

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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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