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 101–110 of 352 games matching Mystery · updated 12 Oct 2026

Filters: Mystery × Clear all
$
Released
Price
$ · Cheap
Players
👥 Up to 5 players
Reviews
60% of 5

The Grounds Escape is a co-op survival horror game for up to 4 players. Team up with your friends to solve intricate puzzles and escape this living hell. Remember: every item has a purpose, every sound has a meaning, and every choice comes with a price... paid in blood.

If you loved these, you'll love this

$
Released
Price
$ · Cheap
Players
👥 1–4 players
Reviews
45% of 20

University 33 is a 1-4 player co-op anomaly detection simulator. Observe your surroundings with unwavering focus: follow the protocol, identify the irregularities, and choose the correct path to reach Floor 33. One lapse in judgment restarts the cycle.

If you loved these, you'll love this

$
Released
Price
$ · Cheap
Players
👥 Up to 4 players
Reviews
100% of 5

Can you escape the cursed temple of Quetzalcoatl? In solo or coop, look out for any anomalies. Observe carefully, as any mistake would be fatal!

If you loved these, you'll love this

$
Released
Price
$ · Cheap
Players
👥 1–4 players
Reviews
100% of 2

Midnight Looters is a 1-4 player co-op horror game where you and your friends explore mysterious forests to find valuable treasures. Face supernatural dangers, collect items, and upgrade your gear to survive the haunted woods.

If you loved these, you'll love this

$
Released
Price
$ · Cheap
Players
👥 1–4 players
Reviews
51% of 96

Mantra is a multiplayer (1-4 player) and single-player psychological-horror game with high tension. Do whatever it takes to save your soul that has been possessed by an demonic spirit. If you don't, demon will imprison you in hell for eternity.

If you loved these, you'll love this

$
Released
Price
$ · Cheap
Players
👥 Up to 5 players
Reviews
98% of 51

Forget all those other cooperative horror games. You never know who's going to win in this 4v1 game where teams and roles can change. The hunter can be the prey, and the prey can be the hunter. Complete the ritual and become a vampire or die as prey to cursed creatures.

If you loved these, you'll love this

$
Released
Price
$ · Cheap
Players
👥 1–4 players
Reviews
0% of 2

A terrifying 1-4 player co-op horror game. Explore 10+ handcrafted Backrooms maps, survive against 8+ unique entities, and use proximity voice chat to coordinate or panic. Your decisions shape the story with multiple endings. Discover optional lore that reveals the truth behind these Backrooms.

If you loved these, you'll love this

$
Released
Price
$ · Cheap
Players
👥 Not stated
Reviews
0% of 1

The game is built using Unreal Engine 5 with an interactive 3D UI. Players must explore the ward and repair damaged circuits while evading the harassment of the Listener. Along the way, they must locate notes left by other survivors. With the help of the item information, they can leave.

If you loved these, you'll love this

Free
Released
Price
Free
Players
👥 Not stated
Reviews
77% of 9

"HSNU Academy 79th Anniversary" is a dark, narrative puzzle game set at HSNU. Explore the campus via chat to uncover secrets and reach multiple endings. This 1-hour experience unlocks Free Mode upon completion. Stay tuned for new games in future celebrations!

If you loved these, you'll love this

$
Released
Price
$ · Cheap
Players
👥 Not stated

Tower Inc. is a survival horror of shifting floors, monsters, and betrayal. Collect quotas as fuel to keep the elevator running — without them, you won’t survive the climb. Work with your team… or leave them behind.

If you loved these, you'll love this