Single-player games like ONTOS
Below are 15 single-player Steam games similar to ONTOS, 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 ONTOS page.
Ranked picks
- 1
The Call Button
Single-player alternative to ONTOS — playable solo, no multiplayer required. Shares Indie and Adventure with ONTOS.
A short horror observation thriller. Could you tell what's real and what isn't? You stole intel from your company. Now you wake up in a hospital every day with two choices: take your medication if something looks wrong, or hit the call button if you're sure the room is safe.
- 2
Runway 66
Single-player alternative to ONTOS — playable solo, no multiplayer required. Shares Indie and Adventure with ONTOS.
A weaponless psychological thriller. Become trapped in the dark simulation within Gabriel’s mind after surviving a deadly plane crash. Run, hide, and piece together your memories to wake from this dystopian nightmare before Protocol 66 is activated.
- 3
Still Here
Single-player alternative to ONTOS — playable solo, no multiplayer required. Shares Indie and Adventure with ONTOS.
Investigate a disturbing murder case in a world shaped by guilt, trauma and fractured memories. Explore unsettling locations, solve puzzles and uncover a truth your mind desperately tried to bury.
- 4
craven bay : source
Single-player alternative to ONTOS — playable solo, no multiplayer required. Shares Action and Indie with ONTOS.
more information coming soon.
- 5
CultureHouse
Single-player alternative to ONTOS — playable solo, no multiplayer required. Shares Indie and Adventure with ONTOS.
Seven days to cultivate the end. CultureHouse is an adventure game where you live in a missing scientist's home-turned-lab, cultivating strange organisms called Geneo. Complete the experiment, and the truth behind the scientist's family — and a world in slow decline — will surface.
- 6
Dead Faces
Single-player alternative to ONTOS — playable solo, no multiplayer required. Shares Action and Indie with ONTOS.
Dead Faces is a mind bending psychological horror. Unravel Jack's disturbing mind, the faces from his past and the ultimate truth behind his actions. You must remember their faces.
- 7
It's Always Happy at Chubby's
Single-player alternative to ONTOS — playable solo, no multiplayer required. Shares Action and Indie with ONTOS.
Welcome to the night shift at Chubby’s, a 24/7 burger joint in the 90s. It's in the middle of nowhere, so you'll be mostly entirely alone. Just keep the store clean and occasionally serve the drive-thru counter. But whatever you do... always follow the rules.
- 8
BrokenLore: DON'T WATCH
Single-player alternative to ONTOS — playable solo, no multiplayer required. Shares Action and Adventure with ONTOS.
In BrokenLore: DON'T WATCH, immerse yourself in the haunting world of Shinji, a young hikikomori trapped in his Tokyo apartment. As his mind unravels, confront a malevolent entity lurking in the shadows. Will you uncover the truth before it's too late?
- 9
SOMA
Single-player alternative to ONTOS — playable solo, no multiplayer required. Shares Action and Indie with ONTOS.
From the creators of Amnesia: The Dark Descent comes SOMA, a sci-fi horror game set below the waves of the Atlantic ocean. Struggle to survive a hostile world that will make you question your very existence.
- 10
Amnesia: The Dark Descent
Single-player alternative to ONTOS — playable solo, no multiplayer required. Shares Action and Indie with ONTOS.
Amnesia: The Dark Descent, a first person survival horror. A game about immersion, discovery and living through a nightmare. An experience that will chill you to the core.
- 11
Amnesia: The Bunker
Single-player alternative to ONTOS — playable solo, no multiplayer required. Shares Action and Indie with ONTOS.
Amnesia: The Bunker is a first-person horror game set in a WW1 bunker. A relentless, AI-driven monster stalks you. Survival depends on finding tools, crafting items, and keeping the lights on.
- 12
Amnesia: Rebirth
Single-player alternative to ONTOS — playable solo, no multiplayer required. Shares Indie and Adventure with ONTOS.
A first-person horror adventure. Uncover your past and survive the Algerian desert. Fear is your enemy; stay calm to not succumb to an illness threatening you and your loved one. Avoid darkness, hide from monsters and solve puzzles. Adventure Mode available for a less scary experience.
- 13
Penumbra Overture
Single-player alternative to ONTOS — playable solo, no multiplayer required. Shares Action and Indie with ONTOS.
Penumbra: Overture is a first person survival horror game, emphasizing on survival and problem solving instead of mindless violence and gore.
- 14
Penumbra: Black Plague Gold Edition
Single-player alternative to ONTOS — playable solo, no multiplayer required. Shares Action and Indie with ONTOS.
Surrounded by enemies and assaulted by terror from all sides, Philip must collect clues and solve vexing puzzles while combating the gnawing psychological terrors that assail his mind and threaten to strip him of his sanity.
- 15
Penumbra: Requiem
Single-player alternative to ONTOS — playable solo, no multiplayer required. Shares Indie and Adventure with ONTOS.
Puzzle expansion for Penumbra: Black Plague. Requiem is part of Penumbra: Black Plague Gold Edition, included in the Penumbra Collection.