Calcium Contract
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About Calcium Contract
Calcium Contract is a fast-paced shooter inspired by ’90s FPS classics, with its own unusual direction. The Calcium Order has enforced the ancient law that “all that lives must die” for millennia, but a strange serpentine creature has seized an island and repelled the Order’s agents. You take a contract from the Order, take up your scythe and sail to the island to reach the creature’s lair.
Climb the island
Fight through over 20 levels as you climb the mountain toward your target. The Calcium Order’s weapons have familiar elements but otherworldly forms and functions. Learn how enemies behave and use that knowledge in combat; some enemies can manipulate others to catch you off guard. If you make a mistake, you can rewind to an earlier point in the level or jump back to a few seconds before your death.
Eternal Harvest
Eternal Harvest is a score-attack mode set in procedural levels that rebuild themselves as you play. You can avoid its curses or seek them out: they increase your score while making the game harder in various quirky ways. Compare scores with friends and other players on the leaderboards, or take on a daily challenge, which gives you one try.
Frequently asked questions
The best price for Calcium Contract is $3.13 at Kinguin. That is 68% less than on Steam, where it costs $9.99. 2 shops have an offer that activates in your country.
Some are. This page only shows offers that activate in your country; offers for other regions, or with no stated region, are left out. To see the offers for another country, change your country at the top of the page.
Every key we list activates on Steam. Redeem the key there and Calcium Contract stays in your library for good.
Yes, with a small risk. Publishers create keys to sell in other shops, which is why a key can cost less than in the official store, and once you activate it the game is yours to keep, just like a store purchase. On average 1–2% of keys fail, so check the shop's buyer protection before you buy: the official store does not refund keys bought elsewhere.
The minimum requirements for Calcium Contract are: Windows 10, 2 GB RAM, 300 MB storage. It runs on Windows only. The recommended specs are in the System requirements section.
No. Calcium Contract is a single-player game.
Yes. Valve rates Calcium Contract as Verified on the Steam Deck: it runs well out of the box.
Buy Calcium Contract 68% cheaper than on Steam.
Calcium Contract is available for 68% less in shops such as Kinguin.
Steam lets publishers create keys to sell in other shops. Once you activate a key, the game is yours to keep, just like a store purchase.
Disclaimer: CD keys have an inherent 1–2% average failure rate. Check the shop terms for buyer protection info. Steam offers no buyer protection for keys bought in other shops and doesn't refund them.













