Single-player games like Calcium Contract
Below are 14 single-player Steam games similar to Calcium Contract, 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 Calcium Contract page.
Ranked picks
- 1
hate.net
Single-player alternative to Calcium Contract — playable solo, no multiplayer required. Shares Action and Indie with Calcium Contract.
An abandoned arena shooter overtaken by bots. You are a mere passerby, a witness to a world that has long been lost to fake accounts and false advertisers. Thousands before you, and thousands after you.
- 2
AMID EVIL
Single-player alternative to Calcium Contract — playable solo, no multiplayer required. Shares Action and Indie with Calcium Contract.
A retro FPS for the ages! Once branded a HERETIC. Now YOU have been chosen as our champion! Reclaim our sacred weapons. Take back our ancient lands. If you can stand... AMID EVIL.
- 3
Ziggurat 2
Single-player alternative to Calcium Contract — playable solo, no multiplayer required. Shares Action and Indie with Calcium Contract.
Ziggurat is back, and now it's even better! Use powerful weapons and spells to break through hordes of enemies and explore labyrinthine dungeons in this hectic roguelite FPS, while you improve your skills and discover new equipment.
- 4
MULLET MADJACK
Single-player alternative to Calcium Contract — playable solo, no multiplayer required. Shares Action and Indie with Calcium Contract.
MULLET MADJACK is a HIGH-OCTANE-ACTION SHOOTER that put you directly inside a CLASSIC ANIME. Pick your favorite weapon and reach the last floor; Beat your best time or try again. Haste makes waste… OF YOUR ENEMIES!
- 5
Guns and Nuns: Storming Hell
Single-player alternative to Calcium Contract — playable solo, no multiplayer required. Shares Action with Calcium Contract.
Demons are not the danger, YOU ARE THE DANGER!!! play as Angelica Amadeus, a nun with the power of faith and guns. Slay demons at your heart's content on bizarre stages with strange gravity fields. Get highscores to unlock more stages and weapons and teach those filthy demons their place.
- 6
Fashion Police Squad
Single-player alternative to Calcium Contract — playable solo, no multiplayer required. Shares Action and Indie with Calcium Contract.
Even at this moment, our fashionable city is under assault. Baggy pants, dull suits, sightings of socks with sandals. A message needs to be sent, and it needs to be sent in style... Time to serve some good ol' Fashion Justice!
- 7
POSTAL: Brain Damaged
Single-player alternative to Calcium Contract — playable solo, no multiplayer required. Shares Action with Calcium Contract.
POSTAL: Brain Damaged is a new, action-oriented take on the Running With Scissors’ cult game series with throwback graphics, and fast-paced, modern gameplay. Take a wild roller coaster ride through the twisted wonderland encased in the POSTAL DUDE’S messed-up mind.
- 8
Rise of the Triad
Single-player alternative to Calcium Contract — playable solo, no multiplayer required. Shares Action with Calcium Contract.
Apogee Software and Interceptor Entertainment proudly present the rebirth of the cult-classic first-person shooter, “Rise of the Triad”. Bigger, better and more ludicrous than ever before.
- 9
Earthworm Jim
Single-player alternative to Calcium Contract — playable solo, no multiplayer required. Shares Action with Calcium Contract.
Jim wasn't always a studly super-worm. He was once just a spineless, dirt-eater with no real mission in his life...
- 10
Hollow Knight
Single-player alternative to Calcium Contract — playable solo, no multiplayer required. Shares Action and Indie with Calcium Contract.
Forge your own path in Hollow Knight! An epic action adventure through a vast ruined kingdom of insects and heroes. Explore twisting caverns, battle tainted creatures and befriend bizarre bugs, all in a classic, hand-drawn 2D style.
- 11
DOOM
Single-player alternative to Calcium Contract — playable solo, no multiplayer required. Shares Action with Calcium Contract.
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.
- 12
Redneck Rampage
Single-player alternative to Calcium Contract — playable solo, no multiplayer required. Shares Action with Calcium Contract.
Well, we crash-landed that UFO in the desert and Bubba says he wants to go home. Heck, I don't blame him 'cause there ain't no place like Hickston. But according to my map, we're gonna have to blast our way through jack o' lope farms and a riverboat as well as a brothel 'fore we get home again.
- 13
HROT
Single-player alternative to Calcium Contract — playable solo, no multiplayer required. Shares Action and Indie with Calcium Contract.
HROT is a single-player retro FPS set in a small socialist country neighboring Soviet Union (Czechoslovakia) after an unspecified disaster in 1986. Those times were dark and terrifying and so is the game.
- 14
Heretic + Hexen
Single-player alternative to Calcium Contract — playable solo, no multiplayer required. Shares Action with Calcium Contract.
Step into the definitive re-release of two dark spell-casting shooters that shaped the genre. This enhanced restoration makes Heretic™ + Hexen™ available to new audiences and long-time fans with expanded accessibility across more platforms and languages than ever before.