Co-op games like Ultimate Backrooms
Below are 8 cooperative Steam games similar to Ultimate Backrooms, 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 Ultimate Backrooms page.
Ranked picks
- 1
Liminal Protocol
Online Co-op alternative to Ultimate Backrooms — playable with friends. Shares Action and Indie with Ultimate Backrooms.
Project your consciousness into a facility transformed into an unstable 3D ASCII lattice. Alone or with up to four Operators, phase through sealed corridors, synchronize Transmit Nodes, survive entities entering through a dimensional tear, and escape before the T-Link rewrites your identity.
- 2
MIMESIS
Online Co-op alternative to Ultimate Backrooms — playable with friends. Shares Action and Indie with Ultimate Backrooms.
4 Player co-op survival horror game. When the cursed rain falls, 'Mimesis' appear, perfectly imitating your teammates, bringing a new level of tension you've never experienced before.
- 3
Deathground
Online Co-op alternative to Ultimate Backrooms — playable with friends. Shares Action and Indie with Ultimate Backrooms.
A 1-4 player co-op horror game that throws you into a desperate fight for survival against deadly dinosaurs. Run, hide and work together to complete missions and uncover the secrets buried within the abandoned AEON research facility. Can you and your friends make it out alive?
- 4
Bunker Invaders
Online Co-op alternative to Ultimate Backrooms — playable with friends. Shares Action and Indie with Ultimate Backrooms.
A co-op horror game where you must scavenge for loot and maintain the bunker to keep it standing
- 5
Backrooms: Extractions
Online Co-op alternative to Ultimate Backrooms — playable with friends. Shares Action and Indie with Ultimate Backrooms.
Cooperate with up to 6 players to explore, search, and extract lost agents within the Backrooms. Solve puzzles, unlock tools, survive against entities, and progress through increasingly dangerous levels.
- 6
The Outlast Trials
Online Co-op alternative to Ultimate Backrooms — playable with friends. Shares Action and Indie with Ultimate Backrooms.
Red Barrels invites you to experience mind-numbing terror, this time with friends. Whether you go through the trials alone or in teams, if you survive long enough and complete the therapy, Murkoff will happily let you leave… but will you be the same?
- 7
Backrooms Lost Runners
Online Co-op alternative to Ultimate Backrooms — playable with friends. Shares Action and Indie with Ultimate Backrooms.
Backrooms Lost Runners is a co-op survival horror with team play, voice-reactive AI, and immersive puzzles. This isn’t a “walking simulator”: explore liminal spaces, outsmart entities, and remember—even a whisper can give you away.
- 8
Lethal Company
Online Co-op alternative to Ultimate Backrooms — playable with friends. Shares Action and Indie with Ultimate Backrooms.
A co-op horror about scavenging at abandoned moons to sell scrap to the Company.