Co-op games like Fadeout: Underground
Below are 6 cooperative Steam games similar to Fadeout: Underground, 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 Fadeout: Underground page.
Ranked picks
- 1

Decisive Strike
Online Co-op alternative to Fadeout: Underground — playable with friends. Shares Action and Indie with Fadeout: Underground.
A sci-fi team-based Third Person Shooter where strategy is as important as your reflexes.
- 2

Rivals Squad
Online Co-op alternative to Fadeout: Underground — playable with friends. Shares Action and Indie with Fadeout: Underground.
Rivals Squad is a game with several exciting game modes that immerse players in a thrilling universe where strategy, competition and power are at the heart of the action. In this game, each participant plays a fearless fighter, seeking to survive in an unforgiving arena!
- 3

DotStrike
Online Co-op alternative to Fadeout: Underground — playable with friends. Shares Action and Indie with Fadeout: Underground.
DotStrike is a 3D online shooter in which alien invaders in the form of colored spheres fight each other in a seaport. But the aliens are not fighting alone.
- 4

Portable Ops
Online Co-op alternative to Fadeout: Underground — playable with friends. Shares Action and Indie with Fadeout: Underground.
In POPS, every bullet fired pushes you further into the chaos of war. The story-driven campaign throws you into the boots of an elite operative. Fight through a series of intense missions, face overwhelming odds, unexpected betrayals, and brutal firefights where only the strongest survive.
- 5

Ai-(Onic)
Online Co-op alternative to Fadeout: Underground — playable with friends. Shares Action and Indie with Fadeout: Underground.
Protect your team's base by building cover and upgrading your weapons. Win the round by destroying the enemy team's base.
- 6

Cerebral Clash
Online Co-op alternative to Fadeout: Underground — playable with friends. Shares Action and Indie with Fadeout: Underground.
Cerebral Clash is a multiplayer arcade shooter where you take control of a tank powered by an enigmatic sentient brain. Play solo in an intriguing campaign or battle online with friends and foes in thrilling warfare matches!