This product is a brand new and unused Core Keeper CD Key for Steam.

Immediately after payment, you will be sent a unique and unused CD Key which can be activated on Steam. You can collect this activation code from our Autokey page.  Simply enter your code into the Steam client (available free from steampowered.com). This will then grant you to a full digital download of the game.

How does our website work?

CJS CD Keys sell brand new CD Keys either taken directly from brand new sealed copies of the game, or sourced directly from world-leading game publishers. We source our keys in bulk directly from leading distributors and publishers, which reduces shipping costs.  This enables us to offer instant online delivery, at extremely competitive pricing.

After you receive your key, you can activate the game on the Steam client (available free from steampowered.com). After you activate the game with the Steam software, you can download the game immediately and instantly.

Benefits of buying from CJS CD Keys:

Instant Delivery

NO payment fees

NO shield fees - we offer a money-back guarantee within the price!

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Region Free

This product key we are selling is sourced directly from the publisher, or an official distributor of the game publisher. The key is completely region free and includes all languages. Region free means that you can activate the product code from anywhere in the world.

About Core Keeper:

Drawn towards a mysterious relic, you are an explorer who awakens in an ancient cavern of creatures, resources and trinkets. Trapped deep underground will your survival skills be up to the task?

Mine relics and resources to build your base, craft new equipment, survive, and power up the Core. Defeat giant monsters, discover hidden secrets, farm crops, cook new recipes and explore a procedurally generated underground world in a mining sandbox adventure for 1-8 players.


Explore a vast underground cave of endless resources. Mine ores, discover hidden crystals, fossils & trinkets and survive a procedurally generated underground world.



Delve into living biomes and fight cavernous creatures in a vast subterranean system. Scour the dark world around you and encounter the behemoths of the underground. Defeat them and take the spoils of victory to help uncover the mystery of the Core.



Customise your character and craft new items, armour and equipment to venture further into the caves. Craft a pickaxe to mine walls and resources, build bridges to cross underground lakes, and place torches to light up the profound ever-present darkness.



Tend your crops to grow a variety of plants by planting seeds found during your adventures. Find the perfect fishing spot and catch a plethora of unique fish. Combine the yield of your hard work farming and fishing in the cooking pot to discover delicious recipes with unexpected effects.



Survive alone or play online with up to 7 other players. Work together to mine resources, fight, farm, craft and survive. Specialise in your role to help your fellow explorers tame the unruly landscape you find yourselves in.