Single-player games like The Citadel
Below are 13 single-player Steam games similar to The Citadel, 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 The Citadel page.
Ranked picks
- 1
Beyond Citadel
Single-player alternative to The Citadel — playable solo, no multiplayer required. Shares Action and Indie with The Citadel.
Beyond Citadel is an anime style retro throwback shooter inspired by the classics of the 90's, with realistic gunplay mechanics, anime violence and fast paced combat. Fight your way through the heavily armed mechanical fortress and discover the secret that lies beneath.
- 2
WRATH: Aeon of Ruin
Single-player alternative to The Citadel — playable solo, no multiplayer required. Shares Action with The Citadel.
Blast, slice and shred through your enemies in this hardcore FPS inspired by the icons of the '90s, powered by the legendary Quake-1 Tech. Taking place in a realm left to rot, take up arms, unearth long-forgotten secrets and hunt down the Guardians of the Old World.
- 3
Warhammer 40,000: Boltgun
Single-player alternative to The Citadel — playable solo, no multiplayer required. Shares Action and Indie with The Citadel.
Load up your Boltgun and unleash the awesome Space Marine arsenal to blast your way through an explosion of sprites, pixels and blood in a perfect blend of Warhammer 40,000, frenetic gameplay and the stylish visuals of 90’s retro shooters.
- 4
Ion Fury
Single-player alternative to The Citadel — playable solo, no multiplayer required. Shares Action and Indie with The Citadel.
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!
- 5
Dread Templar
Single-player alternative to The Citadel — playable solo, no multiplayer required. Shares Action and Indie with The Citadel.
Dread Templar is a fast-paced hardcore old-school FPS, combining classic 90s shooter and modern FPS elements. Unlock and combine dozens of weapon upgrades and skills, embrace the Dread Force and obliterate hordes of fiendish enemies. Become the scariest thing in hell and get your revenge!
- 6
Prodeus
Single-player alternative to The Citadel — playable solo, no multiplayer required. Shares Action and Indie with The Citadel.
Prodeus is a first-person shooter of old, re-imagined using modern rendering techniques and technology. Experience the quality you’d expect from a modern AAA game, designed with retro aesthetics and gameplay that invoke the tech-imposed limits of older hardware.
- 7
Turbo Overkill
Single-player alternative to The Citadel — playable solo, no multiplayer required. Shares Action and Indie with The Citadel.
Enter Paradise as Johnny Turbo—half-metal, half-human, all-murder machine. Clean up the streets with a chainsaw leg, 15+ weapons and your hovercar as you battle the rogue AI Syn, rival bounty hunters and cyberpunks aplenty. Apogee’s most outrageous FPS since Duke Nukem 3D. Good hunting, Sir!
- 8
STAR WARS™: Dark Forces Remaster
Single-player alternative to The Citadel — playable solo, no multiplayer required. Shares Action with The Citadel.
The evil Empire is currently creating a doomsday army behind a veil of secrecy. However, they are no match for the Rebel Alliance's covert operations division. Your mission is to infiltrate the Empire and put an end to their plans for terror and domination.
- 9
Wolfenstein 3D
Single-player alternative to The Citadel — playable solo, no multiplayer required. Shares Action with The Citadel.
World War II rages. The Nazis are planning to build an unstoppable, mutant army. On a mission to steal the secret plans, you were captured and imprisoned. Now, a lucky break gives you the chance to escape, but a maze of passages and trigger-happy Nazis stand in your way.
- 10
Spec Ops: The Line
Single-player alternative to The Citadel — playable solo, no multiplayer required. Shares Action with The Citadel.
A Third-Person modern military Shooter designed to challenge players' morality by putting them in the middle of unspeakable situations.
- 11
Wolfenstein: The New Order
Single-player alternative to The Citadel — playable solo, no multiplayer required. Shares Action with The Citadel.
Wolfenstein®: The New Order reignites the series that created the first-person shooter genre. Wolfenstein offers a deep game narrative packed with action, adventure and first-person combat.
- 12
System Shock
Single-player alternative to The Citadel — playable solo, no multiplayer required. Shares Action with The Citadel.
A first-person fight to the death in the depths of space!
- 13
ULTRAKILL
Single-player alternative to The Citadel — playable solo, no multiplayer required. Shares Action and Indie with The Citadel.
ULTRAKILL is a fast-paced ultra-violent retro FPS that combines the skill-based style scoring of character action games with the unadulterated carnage inspired by the best shooters of the '90s. Rip apart your foes with varied destructive weaponry and shower in their blood to regain your health.