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Project Unknown

Very Positive · 774 reviews · Action · 2025

Project Unknown

6 of the 12 games like Project Unknown are rated Very Positive or higher on Steam. Prices range from $1.99 to $19.99. Released 2021–2025. They notably share the Horror, Online Co-Op tags.

Demonologist

Very Positive · 18.8k reviews · Action · 2023

Like Project Unknown: Horror · Online Co-Op · Multiplayer

Very Positive · 18.8k
Demonologist is a Co-Op horror game that can be played with at least 1 and up to 4 players. Your goal is to identify the type of evil spirit in cursed places and exorcise it using your equipment, either alone or with your team.
AIExorcise ghosts with friends
Action2023.09.25
$19.99

Remnant Records

Very Positive · 417 reviews · Action · 2024

Like Project Unknown: Horror · Co-op · First-Person

Very Positive · 417
Remnant Records is a horror investigation game for 1 to 4 players. Explore places haunted by the dead, survive elaborate and unique ghosts and find out what happened to them through thousands of generated stories.
AIInvestigate haunted places
Action2024.01.23
$15.99 $3.19

LockYourDoor

Very Positive · 140 reviews · Action · 2025

Like Project Unknown: Psychological Horror · Multiplayer · Online Co-Op

Very Positive · 140
Challenging co-op horror (1-4 players). You are looking for your missing friend Darvin. Do whatever it takes to stay alive. Only the patient and the clever will succeed.
AIFind your friend in a horror-filled mystery
Action2025.11.17
$8.99

Unpossess: Exorcism Simulator

Mostly Positive · 369 reviews · Action · 2025

Like Project Unknown: Supernatural · Psychological Horror · Dark

Mostly Positive · 369
Unpossess is a 1-4 co-op exorcism simulator game set in the early 1900s. Players take on the role of exorcists responsible for addressing cases of human possession.
AIPerform exorcisms in early 1900s
Action2025.03.21
$14.99 $7.49

DeathWatchers

Very Positive · 295 reviews · Action · 2024

Like Project Unknown: Investigation · Horror · Online Co-Op

Very Positive · 295
Use the specialized equipment at your disposal to locate & log as many paranormal events as possible. Decipher the ingredients needed for your ritual and try to exorcise any demons within. Any incorrect ingredients and you may never leave! 1-4 Players
AIHunt ghosts with friends
Action2024.07.12
$11.99

Occult

Mostly Positive · 1.5k reviews · Action · 2022

Like Project Unknown: Co-op · Multiplayer · First-Person

Mostly Positive · 1.5k
Occult is a dynamic cooperative game with elements of horror and quest. You are waiting for a variety of opponents, puzzles and endings!
AICooperate through horror
Action2022.05.19
$4.99 $2.49

Spectral Scream

Mostly Positive · 653 reviews · Action · 2024

Like Project Unknown: Survival Horror · Thriller · Demons

Mostly Positive · 653
Spectral Scream is a 1-4 player cooperative horror exploration game. Are you ready to face death in the maw of purgatory? Your goal is to find key items in each chapter and retrieve the orb. But be careful! Threatening and vicious creatures await you at every stage.
AIFace death in purgatory
Action2024.08.28
$9.99 $5.99

Hellcoming

Mostly Positive · 634 reviews · Action · 2021

Like Project Unknown: Survival Horror · Dark · Horror

Mostly Positive · 634
Hellcoming is a co-op horror survival game for 1-4 players, who need to clean large areas from hellish abomination with the help of special tools.
AICleanse hellish threats with friends
Action2021.12.06
$4.99

SKIBIDI GYATROOMS

Mostly Positive · 607 reviews · Action · 2025

Like Project Unknown: Psychological Horror · Co-op · Action

Mostly Positive · 607
Skibidi Gyatrooms is a 1-4 player co-op horror game. You and the homies just fell into the Backrooms, you must out-GYAT the Skibidi Toilet with max rizz or get flushed. Expect cursed levels, and brainrot that’ll keep you on edge.
AIOut-GYAT the Skibidi Toilet
Action2025.01.20
$1.99

Gehinnom

Mostly Positive · 54 reviews · Action · 2023

Like Project Unknown: Survival Horror · Difficult · Online Co-Op

Mostly Positive · 54
Gehinnom is a multiplayer horror game for 1-4 players. collect clues and complete various quests to perform a ritual and banish the demon that hunts you. Everything in Gehinnom is randomly generated, so you will always be scared.
AIBanish a demon with friends
Action2023.10.03
$9.99

Emissary Zero

Very Positive · 2.7k reviews · Adventure · 2025

Like Project Unknown: Multiplayer · First-Person · Psychological Horror

Very Positive · 2.7k
Co-op horror (1-4 players). You are sent to explore a mysterious building at night. Find the Moon and try to return alive.
AIExplore, find the Moon, survive
Adventure2025.03.28
$8.99

Inside the Backrooms

Very Positive · 38.8k reviews · Adventure · 2022

Like Project Unknown: Mystery · 3D · Survival Horror

Very Positive · 38.8k
Inside the Backrooms is a horror multiplayer game mixed with different mechanics that will make you spend an intense night with friends. Explore, think, interact, but be careful, it is rumored that there are several entities wishing to find you...
AIExplore mysterious backrooms with friends
Adventure2022.06.20
$6.99