Single-player games like OSIRIS
Below are 8 single-player Steam games similar to OSIRIS, 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 OSIRIS page.
Ranked picks
- 1
CARNAGE OFFERING
Single-player alternative to OSIRIS — playable solo, no multiplayer required. Shares Action and Adventure with OSIRIS.
Ultra fast-paced sci-fi FPS where you battle waves of robots and genetically engineered creatures. Upgrade your arsenal, unleash explosive physics, and survive relentless combat.
- 2
DOOMED
Single-player alternative to OSIRIS — playable solo, no multiplayer required. Shares Action and Indie with OSIRIS.
DOOMED is a First Person Shooter with horror elements, heavily inspired by old-school shooter classics.
- 3
Trepang2
Single-player alternative to OSIRIS — playable solo, no multiplayer required. Shares Action and Indie with OSIRIS.
Become the ultimate badass in Trepang2: A gory, action-packed FPS set in the near future. Unleash all hell on your enemies, dodge bullets and leave a trail of destruction in this hardcore and frenetic shooter.
- 4
DOOM Eternal
Single-player alternative to OSIRIS — playable solo, no multiplayer required. Shares Action with OSIRIS.
Hell’s armies have invaded Earth. Become the Slayer in an epic single-player campaign to conquer demons across dimensions and stop the final destruction of humanity. The only thing they fear... is you.
- 5
ION Shift
Single-player alternative to OSIRIS — playable solo, no multiplayer required. Shares Action and Indie with OSIRIS.
ION Shift delivers fast, high-stakes gameplay with precision controls and a unique sandbox-style approach to combat arenas. The campaign progressively challenges the player through evolving level design, tight mechanics, and a focus on player-driven mastery.
- 6
DOOM
Single-player alternative to OSIRIS — playable solo, no multiplayer required. Shares Action with OSIRIS.
Now includes all three premium DLC packs (Unto the Evil, Hell Followed, and Bloodfall), maps, modes, and weapons, as well as all feature updates including Arcade Mode, Photo Mode, and the latest Update 6.66, which brings further multiplayer improvements as well as revamps multiplayer progression.
- 7
Serious Sam 4
Single-player alternative to OSIRIS — playable solo, no multiplayer required. Shares Action and Indie with OSIRIS.
Serious Sam 4 reignites the classic FPS series in a high-powered prequel loaded with an explosive arsenal, intergalactic carnage, and perfectly timed one-liners.
- 8
BRUTAL JOHN 2
Single-player alternative to OSIRIS — playable solo, no multiplayer required. Shares Action and Indie with OSIRIS.
Join BRUTAL JOHN and BRUTAL DOG in a ultraviolent old-school FPS set in a world overrun by crypto-mining technologies, where it’s up to you to destroy them and reclaim control. Prepare for an adrenaline ride that pays homage to the best shooters of the '90s.