Co-op games like Project Unknown
Below are 8 cooperative Steam games similar to Project Unknown, ranked by player overlap and content similarity. Every pick supports cooperative play — online co-op, LAN co-op, or shared/split-screen — so you can play with friends right out of the box. imho.run pulls from the same Steam category data Valve uses internally, so "Co-op" 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
Lost Lullabies: The Orphanage Chronicles
Online Co-op alternative to Project Unknown — playable with friends. Shares Action and Indie with Project Unknown.
"Lost Lullabies - The Orphanage Chronicles" is a Co-Op horror game set in 1980, inspired by the real stories of an orphanage ruined by a fire in 1960 Lowell. Playable with 1-4 players, the goal is to identify and expel malevolent spirits alone or with your team.
- 2
Phasmophobia
Co-op alternative to Project Unknown — playable with friends. 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.
- 3
Demonologist
Online Co-op alternative to Project Unknown — playable with friends. Shares Action and Indie with Project Unknown.
Demonologist is a Co-Op horror game that can be played with at least 1 and up to 4 players. Your goal is to identify the type of evil spirit in cursed places and exorcise it using your equipment, either alone or with your team.
- 4
Unpossess: Exorcism Simulator
Online Co-op alternative to Project Unknown — playable with friends. Shares Action and Indie with Project Unknown.
Unpossess is a 1-4 co-op exorcism simulator game set in the early 1900s. Players take on the role of exorcists responsible for addressing cases of human possession.
- 5
Ghost Exorcism INC.
Online Co-op alternative to Project Unknown — playable with friends. Shares Action and Indie with Project Unknown.
Ghost Exorcism INC is a horror game where you can play alone, or in a team of up to 6 exorcists. Your mission will be to identify paranormal entities, and then exorcise them.
- 6
The Devourer: Hunted Souls
Online Co-op alternative to Project Unknown — playable with friends. Shares Action and Indie with Project Unknown.
Play as a paranormal investigator in our hybrid between first person survival and psychological horror story game. Investigate a haunted forest with up to 5 players CO-OP, try to lift the curse, experience a tragic story and take decisions together. Will you survive or will you lose your soul?
- 7
Bureau of Contacts
Online Co-op alternative to Project Unknown — playable with friends. Shares Action and Indie with Project Unknown.
"Bureau of Contacts" - ghost-hunting game for 1-4 players, in which you'll encounter 2 enemies at once - location itself and the ghosts with most human-like intelligence ever. So...look around and watch what you say!
- 8
This is a Ghost
Online Co-op alternative to Project Unknown — playable with friends.
This is a Ghost is a ghost-hunting psychological horror game. Using your equipment, track down paranormal activity and gather evidence to identify the entity, then banish it from this world! Solo and online co-op play for up to 4 players. 👻