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Calcium Contract

Calcium Contract

Calcium Contract is a fast-paced first-person shooter where you're on a mission to finish a contract that got out of hand. Learn to swiftly move around your enemies and master your arsenal as you fight your way toward the grand finale. Includes a unique score-attack mode in ever-changing arenas.

Released Oct 17, 2023 Developer Igor Aleksandrowicz Platforms Windows Arena ShooterBoomer ShooterFPSShooter3D
View on Steam ↗ $9.99 (US · as of 2026-05-18)

What players say

Steam review score and the most-helpful voices, which may include critical ones. Score via Steam as of 2026-09-28.

92.7%positive150 reviews
Recommended · 2 found this helpful

“Super 3D Noah's Ark got a sequel! You are Bob Boner, someone let out the crazy chickens and other animals out of the Ark. Your mission? Send them back to the shadow realm, so God can reset the universe (and make another Morbius movie). But for real, this is a fun, small, boomer…”

— a player, Steam review · 11 hrs played
Recommended · 0 found this helpful

“This is honestly a hidden gem. Gameplay is smooth, weird and cool enemies, interesting and varied levels and the weapons, plus their animations, are really cool. Hope to see another similar game from this dev sometime soon.”

— a player, Steam review · 11 hrs played
Recommended · 0 found this helpful

“This is really crazy. It's not gore and very colourful but it has the cruelty and the gunplay of a serious sam or a doom. Not to talk of the number of enemies that sometimes it's insane. Good job”

— a player, Steam review · 4 hrs played
Read more reviews ↗

Achievement stats

Global completion rates across all Steam players — a data view of how far people actually get. Source: Steam official stats · as of 2026-09-28.

30achievements
8.4%median completion
2.6%rarest: Master of harvest
94.5% of players 64.7% of players 55.2% of players 43.5% of players 42.4% of players 35.1% of players 31.3% of players 30.7% of players 29.8% of players 25.9% of players 21.2% of players 20.4% of players 13.0% of players 9.2% of players 8.6% of players 8.4% of players 8.3% of players 7.7% of players 7.6% of players 5.9% of players 5.8% of players 5.7% of players 5.2% of players 4.6% of players 3.7% of players 3.5% of players 3.4% of players 3.4% of players 2.8% of players 2.6% of players 94.5% 0% most earned rarest
Almost everyone has
94.5%Ashore — Finish the Docks
64.7%Gotcha! — Catch a treasure
55.2%Icarus — Kill a flying sniper just before they take their shot
Rarest badges of honor
2.6%Master of harvest — Get 5000 points in Eternal Harvest
2.8%Hexed — Get cursed 6 times in a single Eternal Harvest run
3.4%Industrial efficiency — Finish the Industrial District in under 90 seconds in one go (no rewinding, no loading)

Latest official news

Developer announcements via the Steam news API — links go to the original posts. More across all games on the news hub.

Mar 14, 2025
Patch 1.1.11

- Leaderboard names with non-latin characters are now shown in a better way - Campaign story text fix

Feb 26, 2025
Patch 1.1.10

Fixed a gamepad issue with sticks not starting from 0 speed when moving out of the dead zone

Feb 17, 2025
Simplified Chinese localization

Calcium Contract is now Available in Simplified Chinese! Localization by ComputerEngine

Feb 11, 2025
Patch 1.1.8

Gamepad fixes and improvements: - The movement speed is now analog - The gamepad acceleration setting should work more intuitively now. You might want to tweak it if it feels off after the update

Feb 03, 2025
New languages

Calcium Contract is now available in 5 new languages: French, Italian, German, Spanish and Brazilian Portugese!

Games like Calcium Contract

From our knowledge graph — ranked by shared traits, not a black box. Each card says why it's here.

AMID EVIL AMID EVIL 93.6% · 6,240 reviews shares Boomer Shooter, Arena Shooter, Surreal, 1990s Project Warlock II Project Warlock II 79.7% · 823 reviews shares Boomer Shooter, Arena Shooter, 1990s, Old School Ziggurat 2 Ziggurat 2 90.0% · 1,078 reviews shares Boomer Shooter, Arena Shooter, Procedural Generation, Old School Wizordum Wizordum 93.1% · 649 reviews shares Boomer Shooter, Score Attack, Old School, FPS Warhammer 40,000: Boltgun Warhammer 40,000: Boltgun 90.1% · 12,434 reviews shares Boomer Shooter, Arena Shooter, 1990s, Old School Fashion Police Squad Fashion Police Squad 87.4% · 975 reviews shares Boomer Shooter, Arena Shooter, Old School, FPS Slayers X: Terminal Aftermath: Vengance of the Slayer Slayers X: Terminal Aftermath: Vengance of the Slayer 97.8% · 1,260 reviews shares Boomer Shooter, 1990s, Old School, FPS MULLET MADJACK MULLET MADJACK 97.4% · 5,084 reviews shares Boomer Shooter, Score Attack, 1990s, FPS

Screenshots

Official Steam store screenshots — click any shot to enlarge.

Facts & details

From the Steam store record, snapshot 2026-09-28.

GenresAction, Indie
Player tagsArena Shooter · Boomer Shooter · FPS · Shooter · 3D · First-Person · Funny · Surreal · Controller · Procedural Generation · Action · Colorful (SteamSpy community voting)
FeaturesSingle-player · Steam Achievements · Full controller support · Steam Cloud · Steam Leaderboards · Family Sharing
LanguagesEnglish * , Czech * , Polish * , French * , Italian * , German * , Spanish - Spain * , Portuguese - Brazil * , Simplified Chinese * *
ControllerFull support
Achievements30
Minimum system requirements (PC)

Minimum: Requires a 64-bit processor and operating system OS: Windows 10 64-bit or later Processor: 2.5 GHz Memory: 2 GB RAM Graphics: Directx 11 support DirectX: Version 11 Storage: 300 MB available space