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 21–30 of 178 games matching Investigation · updated 12 Oct 2026

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Free
Released
Price
Free
Players
👥 Up to 2 players
Reviews
80% of 899

Garisani Detective Agency is a story-driven real-time co-op deduction game for 1990s Korea, play as a brother and his ghost sister, taking cases from the living and the dead. Gather clues from two angles and solve puzzles analog era of pagers and payphones.

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$
Released
Price
$ · Cheap
Players
👥 Up to 8 players
Reviews
100% of 1

Grimm Work is an 8 player co-op horror game where you seek to balance the scales of chaos and order. Fight, hide, or run from a catalogue of monsters from mythologies and folklore around the world in procedurally generated maps. Will you tip the scales towards order or succumb to chaos?

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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
👥 Up to 2 players
Reviews
90% of 30

A social deduction party game where players parkour to school, answer trivia, and hunt down a hidden Class Clown who is sabotaging to try and make the entire group fail!

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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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$
Released
Price
$ · Cheap
Players
👥 Not stated
Reviews
34% of 38

A murder mystery blended with sudoku-style logic and weapons. Explore suspicious rooms, examine weapon evidence, and piece together clues through sharp deduction to reveal the killer. Play alone or work online with up to 4 detectives to solve the case together.

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$
Released
Price
$ · Cheap
Players
👥 Up to 4 players
Reviews
69% of 13

Co-op horror investigation game across multiple maps. Enter procedurally generated environments, use your equipment to gather clues, and identify the entity. Watch your back, because monsters are hunting you down.

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

Co-op or solo sci-fi horror. Purge a biological outbreak with flamethrowers & grenades. Explore infested zones, grab keycards & stuff, then trigger the protocol to burn the Mother Organism. Team up. Erase the threat

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$
Released
Price
$ · Cheap
Players
👥 1–6 players

Co-op horror for 1-6 players. Play as Japanese high school girls, collect Obscure and survive! ⚠️ ALPHA: Very limited content. Buy only to support the project, test core mechanics and give feedback. Otherwise, wait before buying! The story mode is not yet available.

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$
Released
Price
$ · Cheap
Players
👥 Not stated

A sci-fi RPG strategy game where you build fleet, attack, trade and explore space. You can fight yourself, have others help you and upgrade your ship or buy plethora of ships for your space garage.

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