Top similar games like Altarium:

DEVOUR is a co-op horror survival game for 1-4 players. Stop possessed cultists before they drag you to hell. Run. Scream. Hide. Just don't get caught.

SCP: Containment Chaos is a co-op horror survival game for 1-4 players. Become SCP Foundation agents tasked with containing and researching anomalous entities in parallel universes. Solve a variety of unique tasks tailored to each SCP, all while striving to maintain order in the unimaginable chaos.

Escape the Backrooms is a 1-4 player co-op horror exploration game. Traverse through eerie backrooms levels while avoiding entities and other danger to try and escape. Free content updates with new levels and game modes keep the community rewarded.

SKIBIDI BACKROOMS is a cooperative horror game for a group of 1-8 players. Solo mode is also available. You have to survive among the BACKROOMS and find a way out before you are overtaken by the SKIBIDIST. Updates and various interesting things await you...

In Silence is a multiplayer horror game. One player takes on the role of the monster who has hypersensitive hearing abilities and is almost completely blind. The other players(2-6) play as survivors, trying to escape or hunting the monster.

Maid of Sker is a first-person survival horror, set in a remote hotel with a gory and macabre history from Welsh folklore. Brave the nightmares of the Quiet Ones. Do not panic…don’t even breathe!

Dark Hours is a co-op survival horror game for 2-4 players. Your heist has been disrupted by a supernatural event, and your team of robbers is now trapped with an evil entity. Forget your plan, your mission is to survive. Explore and cooperate to find a way out or hide and pray for daylight.

Visage is a first-person psychological horror game. Explore a mysterious ever-changing house in a slow-paced, atmospheric world that combines both uncannily comforting and horrifyingly realistic environments, and enjoy a genuinely terrifying experience.

MADiSON is a first person psychological horror game that delivers an immersive and terrifying experience. With the help of an instant camera, connect the human world with the beyond, take pictures and develop them by yourself. Solve puzzles, explore your surroundings and most importantly, survive.

There is reportedly an evil inside that house. Something about an old funeral parlor offering a last chance to talk to their dead loved ones. Plus something about lights, laughter, a girl, missing people, etc... You know the same stuff everyone claims. Take a team, and check the place out.

Claustrophobia offers a scary and dark horror experience filled with blood boiling moments, first you will have to silently move your way through the darkness, until you can pick up arms and discover the truth. Can you figure out what is hiding in this grueling subterranean facility?

PUPPETEERS is a first person, action packed co-op horror game. Experience a terrifying campaign by yourself, or partner up with up to 4 players in a cooperative horror adventure. Run. Hide. But try not to scream, it might hear you.

INOUT is a cooperative horror game for 1-4 players. For years, the locals have been afraid of an old mansion in Madyland. A possessed maniac and an ancient evil have settled here. Become a member of a team of exorcists and expel the evil force!

FOREWARNED is a 1-4 player co-op survival horror. Delve deep into ancient Egyptian ruins with your team of fellow archaeologists. Investigate phenomena, collect treasure, discover lore, survive danger, and banish the evil that lurks within.

Damned is a randomized online horror game for up to 5 players (4 survivors and 1 monster). You’ll be able to play as one of four people trapped in different haunted places (hotels, hospitals, etc).

Once a mad scientist's lab, now an abandoned manor haunted by miscreations. Work as a 1-4 player team in this online co-op, psychological horror game and discover what lurks within. Find a cure before it's too late...

Silent Rain is a challenging online co-op horror game, for 1 to 4 players. Explore the house, investigate and gather knowledge while hiding from a psycho. How many tries will it take you to master your fear ?

DISEMBOWEL is a cooperative horror game for 1-4 players. You are a reporter who travels around the world documenting the darkest secrets and mysteries that inhabit the planet. Prepare your camera, gather a team and start suffering.

A Stealth Extraction Horror where you and your friends traverse infinite timelines, including those of other players, within an unstable time rift. Upgrade your gear and face interdimensional terrors to survive a fate worse than death. Will you escape the Rift or become its next eternal prisoner?

Freakout is a 1-4 player online co-op survival horror game. Visit your school and find all your seized items and don't get caught by the possessed principal and his pet dog and stop the principal from sacrificing his goats. Stop the Ritual, Run, Scream, hide. Just don't get caught.

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...

FRIGHTENED is a cooperative horror and survival game that can be played with 1-4 players. Your goal is to destroy the evil with your team and leave. Collect items in the area with your team, find the demon's weak spot and destroy it! But don't you dare get caught.

In this multiplayer survival, horror, and deduction game, eight streamers enter a mysterious old building, planning to get famous via a livestream, but two of them become possessed by evil spirits. They will kill their companions and sacrifice them at the altar to complete a sinister ritual.

A Co-op 1-4 player horror survival which will have you searching for clues, items, aiming to solve the mystery of Arcanum whilst running for your life... Discover what happened to the previous residents and escape whilst you can..

Together After Dark is a co-op horror psychological game with a survival touch for 1-4 players. 4 Teens are stuck in the forest and need to find a way out but they are not alone

The story of Henry Bishop is a first-person psychological thriller, where the player will have to fight, guess riddles, immerse into a mystical plot and an incredible story.

Grab your headphones and play one of the most atmospheric horror games on Steam!

『INVITATION To FEAR』 is a survival horror game for 1 to 4 players. After receiving one of the invitations, you will wake up in an unfamiliar place. Before long, you will realize that a terrifying creature is wandering around the building. Don't let "her" find you.

Psycho Reign is a Single or 2 player co-operative online horror puzzle and stealth game where in each level you will be chased by blood thirsty psychos. Look for and solve mini puzzles in order to progress further on the map. Ultimately, find something to fight back...or get chopped up.

A new, immersive Backrooms game featuring many entities and many levels.

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.

Ominous is a thriller/horror game for up to 4 players. In this game, you must collaborate with your teammates to face a creature within an indoor setting. What sets Ominous apart is its unique approach to multiplayer, offering a distinct experience compared to many other horror games available.

UNEASE is a 1 to 4 players co-op survival horror game presenting an array of episodes with innovative mechanics and different settings.

"Spectral Scream", a horror party game is an online co-op horror game for 1-4 players. You need to survive the purgatory between life and death. Don't stop running from the ghosts attacking you. There's no time to be shaking in fear.

Blood Red is a co-op survival horror game that can be played with 1-4 players. Figure out the demon and banish it using your special demon hunting kit!

Woke up in strange dark spot. Who has done it with you? And why? Try to get out from that scary place and stay alive...