Single-player games like Opus Castle
Below are 9 single-player Steam games similar to Opus Castle, 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 Opus Castle page.
Ranked picks
- 1
Bad Omens: 8th Apartment
Single-player alternative to Opus Castle — playable solo, no multiplayer required. Shares Action and Adventure with Opus Castle.
You play as a student named Lisa, who has just moved in with her university friend. But instead of a carefree student life, Lisa faces events full of despair and fear when she is left alone in her apartment number 8...
- 2
Nightwatch at The Museum
Single-player alternative to Opus Castle — playable solo, no multiplayer required. Shares Adventure with Opus Castle.
A routine night shift at an old Javanese museum. A fire from 1990 that nobody talks about. And something, or someone that refuses to let the truth stay buried.
- 3
ADUK: Curse of the Spirits
Single-player alternative to Opus Castle — playable solo, no multiplayer required. Shares Action and Adventure with Opus Castle.
Washed ashore on a forbidden island, you face ruthless soldiers and an invisible terror. Every step brings you closer to breaking the curse… or embracing it forever.
- 4
The Sewer Job
Single-player alternative to Opus Castle — playable solo, no multiplayer required. Shares Adventure with Opus Castle.
You were on the brink of becoming homeless, but that's when you found a sewer job application, you got accepted. What seemed like a chill work at first turned quickly in to an unsettling experience.
- 5
Appalachia
Single-player alternative to Opus Castle — playable solo, no multiplayer required. Shares Action and Adventure with Opus Castle.
The nightmares of Appalachian folklore haunt these hills but nothing is going to stop you from finding your missing Uncle.
- 6
Beyond The Evil
Single-player alternative to Opus Castle — playable solo, no multiplayer required. Shares Action and Adventure with Opus Castle.
Beyond the Evil is an psychological horror game that places the player to a hard experience to find who created one supposed plague that might doom the world.
- 7
Project Smile
Single-player alternative to Opus Castle — playable solo, no multiplayer required. Shares Action and Adventure with Opus Castle.
Uncover the dark secrets of The Haven Institution in this psychological horror adventure. Under Dr. Evelyn Vane’s rule, patients endure twisted experiments in pursuit of “perfection.” Escape is uncertain. Compliance is expected. Eventually, you will find your smile too.
- 8
Lost Eclipse
Single-player alternative to Opus Castle — playable solo, no multiplayer required. Shares Action and Adventure with Opus Castle.
After the city was shrouded with nightmares, you’ve been assigned to dive into this psychological survival-horror adventure to uncover the strange phenomenon that were affiliated to a certain science-tech corporation and bring them to justice.
- 9
Opus Castle VR
Single-player alternative to Opus Castle — playable solo, no multiplayer required. Shares Action and Adventure with Opus Castle.
Opus Castle VR is a 3D horror, adventure and mystery game with a narrative based on the true and tragic story of the small castle on Apa Street, located in the city of São Paulo, Brazil.