Single-player games like The Citadel
Below are 15 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
Sinned Arena
Single-player alternative to The Citadel — playable solo, no multiplayer required. Shares Action and Indie with The Citadel.
Sinned Arena is a classic arena shooter inspired by timeless 90s games. You are trapped in Hell with other unfortunate souls, fighting among each other for demons twisted pleasures. Fight for your way out this dark place but beware, demons aren't there just to watch.
- 2
HEADCUTTER
Single-player alternative to The Citadel — playable solo, no multiplayer required. Shares Action with The Citadel.
HEADCUTTER is a sci-fi spaghetti western FPS with brutal combat, destructible environments, and lots of gore. Track targets as a space bounty hunter, explore maps with multiple routes, and use the crunchy gunplay to cut their heads off so you can get your money!
- 3
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.
- 4
Pile 'Em High Episode 3: Convalescence
Single-player alternative to The Citadel — playable solo, no multiplayer required. Shares Action and Indie with The Citadel.
Deep in Colorado’s Rocky Mountains, a secluded estate becomes ground zero for terror. Pile ’Em High 3 throws you into nonstop action‑horror mayhem—cultists, zombies, abominations—all standing between you and the truth behind the world‑shattering Pandemic
- 5
The Apogee Throwback Pack
Single-player alternative to The Citadel — playable solo, no multiplayer required. Shares Action with The Citadel.
The Apogee Throwback Pack is a collection of four classic Apogee Software titles all in one kick ass package. Blast your way across the galaxy as British Special Agent Blake Stone in "Aliens of Gold" and "Planet Strike", then take on an ancient evil menace as the H.U.N.T in "Rise of the Triad".
- 6
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!
- 7
Rise of the Triad: Dark War
Single-player alternative to The Citadel — playable solo, no multiplayer required. Shares Action with The Citadel.
You are part of an elite group of operatives called HUNT (High-risk United Nations Taskforce), and you must stop a maniac cult leader from killing millions of people. You are equipped with high-tech weaponry and magical instruments that defy description to invade the monastery and stop the madness.
- 8
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.
- 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
rOt
Single-player alternative to The Citadel — playable solo, no multiplayer required. Shares Indie and Casual with The Citadel.
Minimal puzzle game which goal is to get The Ball to the WinBox using the Circles in the scenes. New obstacles introduced every 10 levels
- 14
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.
- 15
Touhou Mystia's Izakaya
Single-player alternative to The Citadel — playable solo, no multiplayer required. Shares Indie and Casual with The Citadel.
A brand new pixel art restaurant simulator based on the Touhou Project! Play as Mystia, the owner of a small izakaya. Collect ingredients by day, cater to the customers by night, learn recipes from familiar characters, and become the best izakaya owner in all of Gensokyo!