Single-player games like SYSTEM INTRUDER
Below are 13 single-player Steam games similar to SYSTEM INTRUDER, 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 SYSTEM INTRUDER page.
Ranked picks
- 1
Redemption
Single-player alternative to SYSTEM INTRUDER — playable solo, no multiplayer required. Shares Action with SYSTEM INTRUDER.
A first-person action horror game set in a military research facility infested with dangerous creatures, navigate your escape while battling to stay alive in this enigmatic location.
- 2
Fortune's Run
Single-player alternative to SYSTEM INTRUDER — playable solo, no multiplayer required. Shares Action with SYSTEM INTRUDER.
Explore a decaying industrial world left behind in humanity's never-ending race to conquer the stars. Beneath its iron skies, desperate souls kill and steal for passage to the still-plentiful frontier worlds. Sink or swim in this high-octane first-person shooter with immersive sim elements.
- 3
Ion Fury
Single-player alternative to SYSTEM INTRUDER — playable solo, no multiplayer required. Shares Action with SYSTEM INTRUDER.
3D Realms, creators of Duke Nukem 3D, Prey, and Max Payne, team up with Voidpoint to bring back the legendary Build Engine, famous for classic shooters like Duke Nukem 3D, Shadow Warrior, and Blood. Fast-paced FPS combat across huge, secret-packed levels. Ion Fury is the real deal!
- 4
System Shock
Single-player alternative to SYSTEM INTRUDER — playable solo, no multiplayer required. Shares Action and Adventure with SYSTEM INTRUDER.
A first-person fight to the death in the depths of space!
- 5
Prey
Single-player alternative to SYSTEM INTRUDER — playable solo, no multiplayer required. Shares Action and Adventure with SYSTEM INTRUDER.
In Prey, you awaken aboard Talos I, a space station orbiting the moon in the year 2032. You are the key subject of an experiment meant to alter humanity forever – but things have gone terribly wrong. The space station has been overrun by hostile aliens and you are now being hunted.
- 6
System Shock® 2 (1999)
Single-player alternative to SYSTEM INTRUDER — playable solo, no multiplayer required. Shares Action with SYSTEM INTRUDER.
"Remember, it is my will that guided you here. It is my will that gave you your cybernetic implants, the only beauty in that meat you call a body. If you value that meat... you will do as I tell you." The cult classic sci-fi horror FPS-RPG has returned.
- 7
Neckbreak
Single-player alternative to SYSTEM INTRUDER — playable solo, no multiplayer required. Shares Action and Adventure with SYSTEM INTRUDER.
An overdose of reality can have dire consequences... Tumble down the rabbit hole and embrace your downfall with 12 endings, non linear day by day progression, sanity system and more...
- 8
HYPERVIOLENT
Single-player alternative to SYSTEM INTRUDER — playable solo, no multiplayer required. Shares Action with SYSTEM INTRUDER.
An ancient evil has awoken in the depths of a remote mining asteroid, stirred from its slumber by man's lust for power. Unaware, you answer a distress call and become stranded, surrounded by monstrous foes. Unravel the mystery of this madness and stop its spread in this horror retro shooter!
- 9
ZERO PROTOCOL
Single-player alternative to SYSTEM INTRUDER — playable solo, no multiplayer required. Shares Action and Adventure with SYSTEM INTRUDER.
In this immersive sci-fi thriller, you will experience the atmosphere of classic 3D games as you solve puzzles, follow an intriguing non-linear storyline, and engage in battles with monsters.
- 10
REPLIKATOR
Single-player alternative to SYSTEM INTRUDER — playable solo, no multiplayer required. Shares Action and Adventure with SYSTEM INTRUDER.
In this twin stick roguelite shooter, you play as one of the galactic mercenaries, explore a mysterious scientific complex and uncover the secret of the REPLIKATOR project.
- 11
INSPACE 2980
Single-player alternative to SYSTEM INTRUDER — playable solo, no multiplayer required. Shares Action and Adventure with SYSTEM INTRUDER.
INSPACE 2980 is a stylish and dynamic SHMUP from the 16-bit era of games consoles and arcade machines. Take part in an exciting adventure and save the galaxy! Once again!
- 12
Iron Dungeon
Single-player alternative to SYSTEM INTRUDER — playable solo, no multiplayer required. Shares Action with SYSTEM INTRUDER.
Iron Dungeon combines a twin-stick shooter, a 2d platformer and a roguelite. Explore a dangerous underground complex in search of dozens of weapons, gadgets and upgrades to find a way to the surface and find out if there is still life on Earth!
- 13
WATERPUNK
Single-player alternative to SYSTEM INTRUDER — playable solo, no multiplayer required. Shares Action and Adventure with SYSTEM INTRUDER.
A roguelite action game inspired by the legendary Enter the Gungeon and Nuclear Throne, set in a post-apocalyptic aquatic world. Shape your strategy by choosing which abilities shine by day and which awaken at night.