Single-player games like Radioactivity
Below are 8 single-player Steam games similar to Radioactivity, 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 Radioactivity page.
Ranked picks
- 1
Echoes Afterfall
Single-player alternative to Radioactivity — playable solo, no multiplayer required. Shares Action and Adventure with Radioactivity.
Team up in a chilling co-op experience, delving into procedurally generated backroom style buildings. Survive together or succumb into the Echoes.
- 2
Phantom Line
Single-player alternative to Radioactivity — playable solo, no multiplayer required. Shares Action and Indie with Radioactivity.
Join the paranormal SWAT. PHANTOM LINE is a co-op (1-4) shooter set in the post-nuclear European continent. Your mission is to search and contain paranormal events and activities (anomalies) hidden from the public eye, in an open world map full of dynamic events.
- 3
Backrooms: The Others
Single-player alternative to Radioactivity — playable solo, no multiplayer required. Shares Indie and Adventure with Radioactivity.
Backrooms: The Others is a cooperative horror game for up to 4 players where you will be forced to explore these unknown nooks and crannies, trying to survive in this complex world where death can be waiting for you at every turn!
- 4
Backrooms: The Next Level
Single-player alternative to Radioactivity — playable solo, no multiplayer required. Shares Indie and Adventure with Radioactivity.
Backrooms: The Next Level is a Co-op horror game up to 4 players, where you and your friends will explore the game, try to pass the game level using your mind, wit, remembering the places where you were
- 5
SCP
Single-player alternative to Radioactivity — playable solo, no multiplayer required. Shares Action and Indie with Radioactivity.
Infiltrate breached SCP facilities in this tactical co-op horror extraction shooter. Survive surreal anomalies, recover forbidden intel, and escape.. or lose everything. The deeper you go, the stranger and deadlier it gets.
- 6
Granny Remake: 2
Single-player alternative to Radioactivity — playable solo, no multiplayer required. Shares Action and Indie with Radioactivity.
Survive a terrifying farm in this co-op multiplayer horror! Hide in cornfields, solve procedural puzzles, and escape before the nightmarish Grandparents find you. Or, play as the killers and hunt your friends down in asymmetrical PvP madness. No two escapes are ever the same.
- 7
PILGRIM
Single-player alternative to Radioactivity — playable solo, no multiplayer required. Shares Action and Indie with Radioactivity.
Pilgrim is a medieval-based, co-op horror, adventure. Can you and your friends make it to the end of The Road?
- 8
MISERY
Single-player alternative to Radioactivity — playable solo, no multiplayer required. Shares Action and Indie with Radioactivity.
MISERY is a 1–5 player co-op survival game set in a nuclear disaster zone. Here, every day is a struggle: search radioactive ruins for resources, build your bunker, craft weapons, and explore a weird, procedurally-generated world with your friends. Beware of anomalies, monsters, and armed bandits.