Online co-op Investigation games

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

Showing 181–190 of 269 games matching Investigation, newest first · updated 13 Oct 2026

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$
Released
Price
$ · Cheap
Players
👥 1–4 players
Reviews
80% of 157

Forsake is a 1 to 4 player co-op online survival horror game where each player is a member of an urban explorer group. Choose your equipment to explore places full of paranormal and exorcise them, if you think you can handle it!

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Deceive Inc.

✓ Deck VerifiedCrossplay
$$
Released
Price
$$ · Standard
Players
👥 Not stated
Reviews
84% of 4,776

Go undercover as the world’s greatest spies in this tense multiplayer game of subterfuge. Disguise as anyone, deploy an arsenal of high-tech gadgets or neutralize the competition. As long as you extract with the objective, no trick is too dirty when you work for DECEIVE INC.

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$
Released
Price
$ · Cheap
Players
👥 Up to 6 players

Archaeologists claimed to have discovered an ancient temple that has been forgotten for centuries. All the tomb raiders are now trying to locate it but you seem to be the first to find it after a long search. Will you be able to find any treasures before the others arrive?

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$
Released
Price
$ · Cheap
Players
👥 Not stated
Reviews
80% of 5

When Travel plans go awry, the only way out is to face the darkness and find a way to survive to make it home alive. With something Lurking in the Dark. You are not alone.You will Have to Face the Darkness to Survive. The question is - Can you Survive?

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Klaus Veen's Treason

Deck Playable
Free
Released
Price
Free
Players
👥 3–16 players
Reviews
89% of 1,530

Treason is a 3-16 player party shooter of teamwork and betrayal, set among Italian mobsters. Use proximity voice chat, unique abilities/gadgets, and strategy to prove your innocence or deceive others.

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$
Released
Price
$ · Cheap
Players
👥 Up to 4 players
Reviews
33% of 12

The Backrooms - Nightmare Dimension is a Co-op online horror game with up to 4 players, where you and your friends take on the roles of soldiers who are part of the SCP Foundation with the mission to eliminate the mysterious entities found in the infamous place called "the Backrooms".

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$$
Released
Price
$$ · Standard
Players
👥 Up to 8 players
Reviews
94% of 35

The next chapter of the Escape Room bundle with better controls and jumping! ;) This time you (alone or with friends) can expect 4 levels, which differ in difficulty. The rooms are designed for a gameplay of 1-1.5 hours each. Can you beat this time again?

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Unsolved Case

Crossplay
Free
Released
Price
Free
Players
👥 Up to 2 players
Reviews
87% of 6,713

A new lead turns up old doubts about an 'Unsolved Case'. A trap, or a copycat killer? In this co-op puzzle game prequel to the award-winning Cryptic Killer series, put on your detective badges as you collaborate and communicate to crack the codes, solve the riddles, and catch the Cryptic Killer.

$
Released
Price
$ · Cheap
Players
👥 1–10 players
Reviews
100% of 3

MindHunt is a solo/multiplayer detective like game (1-10 players), where you as an agent try to find out which androids are infected in order to shut them down! Well, if you are the infected one, you better blend with other androids and complete all tasks necessary!

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