
Unknown Rules is an independently created multiplayer online horror game that supports 1-4 players.
60+ similar titles based on shared tags and player behavior. Themes include Horror, First-Person, 3D, Indie.

Unknown Rules is an independently created multiplayer online horror game that supports 1-4 players.

Shadows At Bay
This is a first-person horror game where you find yourself trapped in a haunted hedge maze at night, chased by a terrifying ghost. You need to use the voice activated lamps to protect yourself and find the way out.

University 33
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.
This is a first-person horror game where you find yourself trapped in a haunted hedge maze at night, chased by a terrifying ghost. You need to use the voice activated lamps to protect yourself and find the way out.
Why similar: Thriller 35.4%, Horror 26%, First-Person 18.9%, 3D 13.1%, Action 4.7%
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.
Why similar: Thriller 25.4%, Horror 16.8%, Co-op 15.1%, Online Co-Op 14.9%, First-Person 12.2%
Necrophoresis is a co-op horror game for 1-4 players. Explore a haunted morgue to find its dark secrets. Use what you can find to make your way through the morgue and find your way out.
Why similar: Thriller 29.4%, Horror 22.6%, Co-op 18.9%, Multiplayer 9.4%, First-Person 8.5%
Peril in the Pines is a short & simple first-person horror game where the player is trapped on an island with strange creatures. The player must collect the resources to fix their boat before being caught and getting trapped forever.
Why similar: Thriller 40.1%, Horror 26.6%, First-Person 12.2%, 3D 11.4%, Story Rich 7.9%
Specter Trail is a gripping horror game where you play as Fares, a private investigator unraveling the dark secrets of the Vanderbilt family. Immerse yourself in a linear narrative filled with unexpected twists, eerie specters, and challenging puzzles.
Why similar: Thriller 35.3%, Horror 22.6%, First-Person 20.6%, 3D 17.9%, Indie 3.6%
Behind The Backrooms: Lost Levels is survival horror game where you explore eerie, hidden levels filled with terrifying entities, cryptic puzzles, and relentless dangers. survive deadly encounters, and find your way out—before you become another lost soul trapped forever.
Why similar: Thriller 29.2%, First-Person 15.7%, Horror 13.5%, 3D 12.8%, Co-op 7.9%
A psychological horror game that centers on exploration, puzzle-solving, and terrifying entity encounters
Why similar: Thriller 23.3%, Horror 17.4%, First-Person 15.9%, 3D 13%, Co-op 9.5%
Race against a relentless monster in this heart-pounding multiplayer horror. Play as one of four survivors trapped in an asylum, working together to solve puzzles and search for keys. You can't fight back - only escape. Will you outwit the monster and find freedom, or succumb to the darkness?
Why similar: Horror 21.8%, Online Co-Op 19.5%, Co-op 18.5%, First-Person 15.6%, 3D 9.6%
Dive into heart-pounding terror with our CO-OP horror experience for 5 PLAYERS. Uncover chilling mysteries, face unspeakable horrors, and survive together in this intense collaborative nightmare. Will your team escape the shadows, or succumb to the darkness that lurks within?
Why similar: Horror 19.2%, First-Person 17.5%, Thriller 15.4%, 3D 14.3%, Co-op 13.1%
This is an asymmetrical multiplayer horror game. Deep within pitch-black ruins, with only the beam of a flashlight to guide you, the children must play KAKUREONI -a deadly game of hide-and-seek- to bring an end to the ritual of reincarnation.
Why similar: Horror 21.4%, Online Co-Op 19.8%, Co-op 17.7%, First-Person 14%, 3D 10.2%
Escape: School is a 1~6 co-op multiplayer horror game set inside a school where an incident is happening. Cooperate with your friends, find the name of the student who has died and grieve to escape from this school!
Why similar: Thriller 26.3%, Horror 17.6%, Online Co-Op 16.4%, Co-op 14.7%, First-Person 11.3%
Distressed is a 5 player online co-op horror game. Welcome to G.H.O.S.T. HQ. Forget what you know about ghost hunting. This is Not a Sanity Based Game. First you feed it energy, Then you feed it souls. Will you survive?
Why similar: Horror 23.9%, First-Person 23.2%, Co-op 19.2%, Online Co-Op 17.6%, Multiplayer 7.4%
Chained in the Backrooms is a 1-4 player co-op, mission-based horror game. Trapped in a blurry subconscious and chained together, toy bears must solve puzzles, complete challenging missions, and survive against creatures trying to destroy them.
Why similar: Thriller 24.3%, Online Co-Op 16.7%, Horror 16.4%, First-Person 11.6%, Co-op 11.3%
Nostalgia is a two-player cooperative indie game that escapes from enemies in a dark labyrinth. After waking up in the deep, dark forest, the two follow an unidentified girl into the labyrinth. Avoid enemies in the labyrinth, find a diary, reveal the hidden past, and escape.
Why similar: Horror 25.8%, Co-op 21%, First-Person 17.1%, Online Co-Op 17.1%, Multiplayer 9.9%
Unhuman Nightmare is a 4 player online co-op game where a team of thieves want to steal items from haunted places. What they don't know is that the places are full of traps set by ghosts. Chances are, they'll not escape alive...
Why similar: Thriller 20.4%, Horror 17.4%, Online Co-Op 17.3%, Co-op 15.7%, First-Person 14.2%
Out of Place: Origin is a survival game built on attention and observation. In a diner where reality quietly collapses, notice the anomalies, capture them on camera, and survive… Because sometimes, the thing watching you isn’t a mistake.
Why similar: Thriller 36.1%, Horror 23%, First-Person 20.9%, 3D 18.1%, Indie 2%
Work together with your team in a lab filled with deadly mutations. Eliminate the Primary Mutation and claim your reward. Only those who survive can pay off their debt.
Why similar: Horror 24.7%, Co-op 19%, Online Co-Op 17.7%, First-Person 11.5%, Multiplayer 11%
Anomaly Express is a 1-4 player Co-op Horror aboard a winter train. Uncover hidden anomalies, avoid deadly encounters, and discover why this journey feels endless… before it claims you.
Why similar: Thriller 25.1%, Horror 17.9%, Online Co-Op 16.7%, Co-op 14.3%, First-Person 12%
Behind the Backrooms is a 1-4 player co-op horror exploration game
Why similar: Thriller 33.8%, Horror 19.2%, Co-op 16.4%, First-Person 12.3%, 3D 8.7%
Finally, home alone. With your parents and brother away on holiday and not due back for days, you've got the whole place to yourself. Sounds perfect: until you accidentally leak your address online to someone who will turn your curiosity into the biggest regret of your life.
Why similar: Thriller 32.6%, First-Person 21.5%, Horror 19.1%, Story Rich 13.2%, 3D 5.5%
Fearwoods is a co-op survival horror where light and silence are your only weapons. Explore the cursed forest, uncover Aveline’s story, evade a relentless demon, and fight for escape before the darkness consumes you.
Why similar: Horror 26.3%, Online Co-Op 21.2%, Co-op 17.6%, 3D 11%, Multiplayer 10.7%
Everything is for Humanity is a story-driven, exploration and puzzle-solving based science fiction horror game which sets in a massive science facility in 2020. You will discover tons of things and find out about the blood-chilling truths with its first-person experience.
Why similar: Horror 20.9%, Thriller 18.9%, First-Person 17.8%, Story Rich 10.9%, 3D 8.8%
Hello, Friend, welcome to Desserted. Together we'll answer the Universe's most important question: "What's for dinner?" 6-player co-op survival adventure; Eat, stealth, fight, sacrifice; Explore lost planets within time limits; Survive. Get stronger. Explore worlds
Why similar: Thriller 30.3%, Horror 18.1%, Online Co-Op 16.6%, First-Person 10.7%, 3D 9.6%
Survive the hunt—find the item and use it before the monsters catch you. Search the darkness, uncover secrets, and face the terrifying truth. 4-player co-op with proximity chat—stick together or be lost to the lurking terror. Your friends are your only lifeline. Will you survive?
Why similar: Horror 23.5%, Co-op 21%, First-Person 16.6%, Online Co-Op 16.3%, 3D 10.4%
Bonded Forever is a co-op game that combines horror and puzzle elements. In this game, you and your friend try to go back to the place where you live in your childhood and solve the mysteries that happened while you were away and try to overcome the problems you will face by working together.
Why similar: Thriller 22.8%, Horror 18.3%, First-Person 16.6%, 3D 13.5%, Co-op 8.7%
Paper Dolls Original is a first-person horror adventure game steeped in Eastern culture. You act a man who is separated from his daughter after a car accident. When he awakes, he finds himself in a deserted Asian mansion. Find your daughter and unveil a terrifying story buried for a hundred years
Why similar: Thriller 42.6%, Horror 37%, First-Person 9%, Multiplayer 5.9%, Action 3.2%
A found-footage co-op horror from the criminals’ perspective. Complete tasks for the criminal syndicate.
Why similar: Horror 31.9%, Co-op 21.7%, First-Person 15.8%, Online Co-Op 14.3%, Multiplayer 9.8%
If you scream, it's game over! A death game linked with a microphone. Can you escape from the closed haunted house?
Why similar: Thriller 28.4%, Horror 25.1%, First-Person 20.3%, 3D 14.9%, Story Rich 10.7%
Welcome to the hell...
Why similar: Horror 21.9%, First-Person 21.7%, Co-op 15.2%, 3D 15.1%, Online Co-Op 11.5%
Cursed Weekend is a game for a group of five players in which: four trapped young people and one sneaking evil. But what kind of evil, this is exactly what you have to find out. Maniac killer, poltergeist, cursed doll, demon or ... You never know for sure.
Why similar: Horror 24.9%, Online Co-Op 20.9%, Co-op 19.1%, First-Person 14.1%, 3D 7.2%
Toy Scrappers is a thrilling chase-based horror game that can be played with up to 16 players. Some players take on the role of a killer attempting to capture others. Escape the madness and stay alive!
Why similar: Thriller 28.8%, Horror 18.1%, Online Co-Op 16.6%, First-Person 10.6%, Multiplayer 9%
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.
Why similar: Thriller 26.1%, Online Co-Op 16.2%, Co-op 14.8%, Horror 13.6%, First-Person 10.8%
“Lost Soul” is a multiplayer horror survival game for 1-4 players. Work together to rescue possessed souls, using your surroundings and strategy to fight and escape. Play cautiously to avoid detection while experiencing fear and excitement. Join with others, scream, and defeat the ominous threat.
Why similar: Thriller 35.7%, Online Co-Op 17.8%, Horror 16.8%, First-Person 9.1%, Multiplayer 9%
Again and Again is a first-person psychological horror game. How much can a game affect your real life? Enjoy the terrifying moments of being in a realistic home environment and a suspenseful story.
Why similar: Thriller 44.2%, Horror 22%, First-Person 15.6%, Story Rich 12%, Multiplayer 4%
An ultra-realistic co-op Backrooms experience for 1–6 players. Backrooms (2026) offers a mix of “classic” and brand-new, all original levels. Explore the levels, discover hidden routes, and cooperate with your team to escape.
Why similar: Horror 25.9%, First-Person 24.7%, Co-op 21.4%, Online Co-Op 15.9%, Multiplayer 10.3%
“Restricted Footage” is a horror and survival game for up to 4 players. You are entering into an area, where reportedly paranormal stuff is happening. Your purpose here is to take a footage with your action cam and to solve the paranormal case.
Why similar: Thriller 23.4%, Horror 17.9%, Online Co-Op 16.8%, Co-op 15.9%, Multiplayer 8.8%
Developed and published by Levienze Games, this game is a short story based horror and thriller game.
Why similar: Thriller 42.4%, Horror 27.9%, First-Person 27.2%, Indie 2.5%
The Key to Forgotten Souls is a psychological horror game focused on exploration, mystery, and immersive storytelling. Explore dark abandoned locations, solve puzzles, uncover hidden secrets, and survive a haunting story where lost souls and terrifying truths await.
Why similar: Thriller 21.3%, Horror 20.5%, Online Co-Op 17.7%, Co-op 14.3%, First-Person 10.2%
A co-op horror game for 2 players, where you risk your life outside to entertain a world that never leaves home. On Follow Us, contestants work in pairs: one explores, the other guides. Trust is your lifeline.
Why similar: Horror 26.1%, Online Co-Op 22.7%, Co-op 21.2%, First-Person 16.5%, 3D 6%
Psychoscopy is a 5 player co-op horror game that you try to gather evidences about paranormal activities in large areas. Make a team with your 4 friends, take your equipments and hunt down paranormal activities.
Why similar: Thriller 33.9%, Horror 15.8%, First-Person 15.7%, Online Co-Op 11.7%, Co-op 5.8%
This time, you're trapped in a convenience store, and it’s nighttime! The difficulty has been raised—find every anomaly and escape through the correct door.
Why similar: Thriller 42.4%, Horror 24.7%, 3D 17%, First-Person 13.8%, Indie 2.2%
Cursed Despair offers a chilling experience where you and your friends will face a mysterious monster, plunging into deep despair. Gather the necessary items to survive, perform the ritual, and stand firm amidst the darkness.
Why similar: Horror 18.6%, Thriller 18.2%, Online Co-Op 17.1%, Co-op 14.9%, First-Person 10.5%
One evening, after leaving work, a young woman goes missing and wakes up in a basement cell. A dark voice from a speaker says: “If you want to escape, you must solve the puzzles.” But this isn’t a rescue — it’s a game. And no one has ever won.
Why similar: Thriller 44.5%, First-Person 21.8%, Horror 21.5%, Action 8.8%, Indie 3.3%
After arriving home, you find that no one is home. Strange events begin to happen and you realise that you are not alone. Investigate, search for clues, solve puzzles and find out what has happened to your family.
Why similar: Thriller 39.9%, Horror 22.1%, First-Person 13.6%, 3D 10.7%, Story Rich 8.6%
Face terrifying enemies from another planet who want to stop you at all costs in this first-person adventure. Explore terrifying and dark settings, solve puzzles and use the objects you find on the map to progress in your adventure.
Why similar: Thriller 33.8%, Horror 21%, First-Person 16.8%, 3D 12.3%, Story Rich 11.1%
《Homework Is Crazy》is a game that simulates Chinese primary school students doing their homework. Here you will become a new generation primary school student, and face the mountain of tons of homework. This may be the biggest challenge you have ever encountered!
Steal, grab, and run with your loyal pirate crew! Last Pirates: Die Together is a fun co-op horror game to experience all the challenges of scavenging. Fight or hide – it's up to you in this endless adventure. Leave the island in one piece or die trying!
Why similar: Online Co-Op 23.4%, Horror 22.3%, Co-op 19.6%, First-Person 16.4%, 3D 11.3%
A cooperative sci-fi horror experience set in the underground facility known as RDL. Explore randomized floors, collect strange artifacts, and survive AURORA - the rogue AI overseeing your “rehabilitation.” Research continues whether you live or not.
Why similar: Horror 24.9%, Online Co-Op 22.3%, First-Person 14.8%, Multiplayer 11.4%, 3D 10.4%
Inside My Mind is a first-person psychological horror game set in an abandoned hospital. Explore dark corridors, solve puzzles, and uncover through notes who you are, why you are here, and the hospital’s dark past.
Why similar: Thriller 41.4%, Horror 27.2%, First-Person 20%, 3D 9.7%, Indie 1.7%
If sleep is a long torment...
Why similar: Thriller 44.5%, Horror 26.8%, First-Person 23.8%, Indie 4.8%
Horror Squad is a 1-4 player online co-op horror game. Assemble your squad to clear the areas cursed by terrifying creatures.
Why similar: Thriller 28.9%, Horror 18.1%, Co-op 15.9%, Online Co-Op 13.8%, First-Person 9.5%
A 3–6 player online horror game of deception and survival. Explore a maze and uncover the hidden Skinwalker before it’s too late. Use tools, voice chat, and evidence to expose the killer among you.
Why similar: Horror 26.3%, Online Co-Op 22.4%, Thriller 14.8%, 3D 11.7%, Multiplayer 10%
Medieval Nightt is a first-person horror game where, as a young adventurer, you explore an ancient medieval empire in ruins, facing restless spirits and paranormal creatures while unraveling the dark secrets of a lost civilization.
Why similar: Thriller 44.9%, Horror 27.5%, First-Person 19.1%, 3D 6.7%, Indie 1.8%
Chased by Darkness is a 1-4 players co-op survival horror. Your mission is to face supernatural entities and banish them to the spiritual plane. Explore, fight enemies and don't let the darkness reach you.
Why similar: Horror 21.8%, Thriller 20.8%, Online Co-Op 18.3%, Co-op 16.1%, First-Person 9.9%
F-Rank Hunter: Survivor is a 1–4 player co-op game where you mine Mana Stones inside dangerous Gates. Escape threats, pay your taxes, and grow from a powerless F-Class into a true Hunter—alone or with your team.
Why similar: Online Co-Op 23.5%, Co-op 20.9%, Horror 17.9%, First-Person 17.4%, Multiplayer 10%
Helios Hotel: The Night Shift is a story-driven choose-your-own-adventure style horror game inspired by paranormal and slasher films.
Why similar: Thriller 50.7%, Horror 32.2%, Story Rich 14.7%, Indie 2.4%
Tutsak is a 4-player co-op horror game. Collect keys in abandoned locations and escape. The creature can capture and imprison you or spare you. Your teammates must rescue you, or your escape attempts are limited. Teamwork is essential for survival!
Why similar: Thriller 31.8%, Horror 18.1%, Online Co-Op 15.8%, Co-op 12.7%, First-Person 9.9%
In this (up to) two-player stealth horror game, you are trapped in an haunted Austrian hotel inhabited by a Percht and other creatures from alpine folklore. You must work together, solve puzzles and avoid detection to escape the hotel alive.
Why similar: Thriller 25.2%, Horror 17.6%, First-Person 15.3%, 3D 12.2%, Co-op 11.2%