Single-player games like Project Unknown
Below are 11 single-player Steam games similar to Project Unknown, 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 Project Unknown page.
Ranked picks
- 1
Sinever: First Seal
Single-player alternative to Project Unknown — playable solo, no multiplayer required. Shares Action and Indie with Project Unknown.
Sinever: The First Seal is a 1–4 player co-op psychological horror game. Explore an isolated Victorian estate, operate paranormal equipment, manage your sanity, and uncover the truth behind its imprisoned entity before the house claims you too.
- 2
Deepscape Inc
Single-player alternative to Project Unknown — playable solo, no multiplayer required. Shares Action and Indie with Project Unknown.
2 to 4 player co-op horror game. You wake up marked with an ID number you can't see on your own back. Only your fellow inmates can read it. Find each other, share your numbers, reach your validation rooms, and get out before whatever roams the halls finds you first." en francais
- 3
Dark Past
Single-player alternative to Project Unknown — playable solo, no multiplayer required. Shares Action and Indie with Project Unknown.
Dark Past is based on psychological horror by paranormal activity occurring during your investigations. Play solo or up to 4 players to try and solve the mystery of what entity is left behind.
- 4
Phasmophobia
Single-player alternative to Project Unknown — playable solo, no multiplayer required. Shares Action and Indie with Project Unknown.
Phasmophobia is a 4 player online co-op psychological horror. Paranormal activity is on the rise and it’s up to you and your team to use all the ghost-hunting equipment at your disposal in order to gather as much evidence as you can.
- 5
Soul Hunter
Single-player alternative to Project Unknown — playable solo, no multiplayer required. Shares Action and Indie with Project Unknown.
A 1-4 player co-op psychological horror where your camera lens is your only charm. Exorcise evil spirits, dispel illusions, and seal cursed souls onto film before they claim yours.
- 6
The Backrooms - Nightmare Dimension
Single-player alternative to Project Unknown — playable solo, no multiplayer required. Shares Action and Indie with Project Unknown.
The Backrooms - Nightmare Dimension is a Co-op online horror game with up to 4 players, where you and your friends take on the roles of soldiers who are part of the SCP Foundation with the mission to eliminate the mysterious entities found in the infamous place called "the Backrooms".
- 7
Grinnel
Single-player alternative to Project Unknown — playable solo, no multiplayer required. Shares Action and Indie with Project Unknown.
If you stop, the light dies. If you turn, darkness takes over. As a patient trapped in Grinnel, escape this psychological horror nightmare with Dr. Esin. Use your visor in the atmospheric labyrinth and never look back; in this surreal thriller, your gaze is your worst enemy.
- 8
Moved mind
Single-player alternative to Project Unknown — playable solo, no multiplayer required. Shares Action and Indie with Project Unknown.
Moved mind is a first person narrative psychological horror game, where you will be the subject of a psychological experiment where you will have to face your fears and differentiate reality from the symptoms of your illness.
- 9
The Dark Pictures Anthology: Man of Medan
Single-player alternative to Project Unknown — playable solo, no multiplayer required. Shares Adventure with Project Unknown.
The Dark Pictures Anthology is a series of stand-alone, branching cinematic horror games that can also be played online with a friend. In Man of Medan, five friends set sail on a holiday diving trip that soon changes into something much more sinister.
- 10
Implements of Hell
Single-player alternative to Project Unknown — playable solo, no multiplayer required. Shares Action and Indie with Project Unknown.
Implements of Hell is a first-person psychological horror game. Explore the mysteries, unlock the secrets, and change the outcome in a slow-paced atmospheric, and extremely horrifying experience.
- 11
Omitted
Single-player alternative to Project Unknown — playable solo, no multiplayer required. Shares Action and Indie with Project Unknown.
Omitted is a first-person psychological horror game. Experience being left alone in an old hospital, discover its secrets and try to survive.