Single-player games like Atrium Mortis
Below are 8 single-player Steam games similar to Atrium Mortis, ranked by player overlap. Every pick carries Steam's Single-player category, so multiplayer-only titles or always-online games don't sneak in. imho.run pulls the category data from Steam directly — Single-player here matches what the store labels.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Atrium Mortis page.
Ranked picks
- 1
No One Here But Me
Single-player alternative to Atrium Mortis — playable solo, no multiplayer required. Shares Action and Indie with Atrium Mortis.
Work as a night administrator at a computer club, check visitors, detect anomalies, and survive nightmare-filled nights full of monsters and mysteries.
- 2
The One Who
Single-player alternative to Atrium Mortis — playable solo, no multiplayer required. Shares Action and Indie with Atrium Mortis.
Step into the shoes of a father searching for his missing daughter in a nightmare world. Explore eerie, shifting locations, hide in the dark from unnatural creatures, and follow a mysterious voice to piece together the truth before it's too late.
- 3
Mundaun
Single-player alternative to Atrium Mortis — playable solo, no multiplayer required. Shares Action and Indie with Atrium Mortis.
Mundaun is a lovingly hand-penciled horror tale set in a dark, secluded valley of The Alps. Explore various areas full of secrets to discover, survive hostile encounters, drive vehicles, fill your inventory, and solve a variety of handcrafted puzzles.
- 4
Inside Depth 6
Single-player alternative to Atrium Mortis — playable solo, no multiplayer required. Shares Action and Indie with Atrium Mortis.
There are 6 depths to descend; the further you go, the more terror you will experience. Uncover mysteries, solve puzzles, and immerse yourself in a dark storyline that Inside Depth 6 has to offer. Journey through all 6 depths to uncover the secrets buried within.
- 5
Abandoned Souls
Single-player alternative to Atrium Mortis — playable solo, no multiplayer required. Shares Action and Indie with Atrium Mortis.
Abandoned Souls is a horror game, shown through a GoPro lens. You play as a vlogger who specializes in urban exploration.
- 6
Clink
Single-player alternative to Atrium Mortis — playable solo, no multiplayer required. Shares Indie and Adventure with Atrium Mortis.
You are a lonely woman, secluded in a house with your cat... and the secrets of the past. What hides within your mind — illness, or something otherworldly? Nightmares and reality intertwine… everything is so foggy. Do you have the courage to remember what happened?
- 7
No one lives under the lighthouse Director's cut
Single-player alternative to Atrium Mortis — playable solo, no multiplayer required. Shares Indie and Adventure with Atrium Mortis.
A slow burn retro horror game, in which you arrive at the old lighthouse on a small island near the coast of the United States. After the previous keeper has gone missing, you need to take over his duties and watch after the light.
- 8
Fears to Fathom - Norwood Hitchhike
Single-player alternative to Atrium Mortis — playable solo, no multiplayer required. Shares Indie and Adventure with Atrium Mortis.
Holly Gardner, a 19 year old on an interstate drive experiences unusual happenings that leads to an unplanned stay at a motel, little did she know what was transpiring down in Norwood Valley.