Co-op games like RADIOACTIVE INC.
Below are 8 cooperative Steam games similar to RADIOACTIVE INC., 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 RADIOACTIVE INC. page.
Ranked picks
- 1
Backrooms Escape Protocol
Online Co-op alternative to RADIOACTIVE INC. — playable with friends. Shares Indie with RADIOACTIVE INC..
Backrooms Escape Protocol is a multiplayer horror game where you and your friends explore eerie backrooms, evade terrifying entities, and uncover hidden secrets. Work together to survive the endless maze and escape before it's too late!
- 2
NightBreak
Online Co-op alternative to RADIOACTIVE INC. — playable with friends. Shares Casual with RADIOACTIVE INC..
NightBreak is a co-op prison escape game set at night. Start in your cell and try to escape the prison with your friends. Explore, find tools, unlock doors, avoid guards and lights, and stay quiet — too much noise or one wrong step can give away your position.
- 3
Backrooms Media
Online Co-op alternative to RADIOACTIVE INC. — playable with friends. Shares Indie with RADIOACTIVE INC..
Backrooms Media is a 1-4 player co-op horror that plunges you into unsettling, hyper-realistic liminal spaces. Navigate eerie environments filled with lurking horrors. Group up with your friends to face the terror of the endless backrooms together and... try to escape.
- 4
Resurection.
Online Co-op alternative to RADIOACTIVE INC. — playable with friends. Shares Indie with RADIOACTIVE INC..
Resurrection is a wave-based indie FPS by Bad Dev Studios. Fight endless, aggressive zombie hordes in a burning city. spend points at the random weapon box for better firearms, manage your ammo, and use precision sniping to survive increasingly difficult waves.
- 5
Blackroots
Online Co-op alternative to RADIOACTIVE INC. — playable with friends. Shares Indie with RADIOACTIVE INC..
Blackroots is a co-op fantasy/horror game where players work together or alone to resist a dark force known as Ul'vorran.
- 6
Mimic
Online Co-op alternative to RADIOACTIVE INC. — playable with friends. Shares Indie with RADIOACTIVE INC..
Deduce who you can trust in this asymmetrical online survival horror game for up to 10 players. Solve the objectives, survive the killer Android hunting you, and hunt from the shadows as the Mimic; a shape-shifting terror hiding amongst you.
- 7
H.Z.T.
Online Co-op alternative to RADIOACTIVE INC. — playable with friends. Shares Indie with RADIOACTIVE INC..
You wake up in a giant techno-complex that has survived a catastrophe. You are surrounded by mutants, hostile systems, and endless railways between modules. With no memory and no chance of help, all you can do is search, survive, and try to understand why the entire complex is trying to erase you.
- 8
KunKun dream Startles the Soul
Online Co-op alternative to RADIOACTIVE INC. — playable with friends. Shares Indie with RADIOACTIVE INC..
Multiplayer , yes! You have been trapped in KunKun's dream, you and your trapped companions have to find a way to escape and avoid these Grotesque Object! Grotesque Objectlike playing basketball and worship chickens, hate watermelons, and even come Let me see