Buy CTHON PC Key

Where to buy CTHON at the best price? As of 27 Aug 2026 the cheapest option is $4.99 at Steam, out of 3 offers across 3 stores. The range reaches $199.41, so the distance between the first and the last listing can be wide even with a handful of sellers. You activate the key in Steam or another client, and it is worth checking the price history first. This game has been cheaper before, on 97% of the days we have data for. A price alert will let you know when the next drop comes. On PC you buy a key that you activate in Steam or another client, and this is the widest market we track, with more than a quarter of games carrying a keyshop offer.

Release: 17 Mar 2017
Gravity Games
Gravity Games
Metacritic:
tbd tbd
Steam:
Mostly Positive (84)
Buy in Official Store:
$4.99
Buy in Keyshops:
$199.41
In keyshops, it was cheaper on 97% of days with data.
See price history

Official Stores (1)

DRM:
Steam
Steam
Steam
CTHON
Windows
1y ago
DRM:
Steam
Steam
$4.99

Keyshops (2)

DRM:
Steam
Steam
G2Play
CTHON Steam CD Key
Windows
1d ago
DRM:
Steam
G2Play
~$199.41
-8% with XD8DEALScopy
-8% with XD8DEALScopy
Kinguin
CTHON Steam CD Key
Windows
1d ago
DRM:
Steam
Kinguin
~$199.41
-8% with XD8DEALScopy
-8% with XD8DEALScopy

About CTHON

CTHON - about the game
In the 24th century, a colony on a misshapen moon in the Epsilon Eridani asteroid belt unearths an incomprehensible evil called Cthon. Players fight through nine sprawling, randomly generated levels in this old-school science-fiction first-person shooter, blending classic space horror with permadeath tension. Cybernetic upgrades from ancient alien tech let you customize stats, defenses, and firepower across millions of build options. Battle corrupted humanoids, alien abominations, and biomechanical constructs, each demanding unique tactics. Use nano-tech currency at machines to forge items, restore resources, and expand your framework, while hunting secret areas for rewards. Pick from three specialized characters and multiple difficulty levels to tailor the oppressive atmosphere. Fans of Doom, System Shock, and Quake will relish the unrelenting replayability and strategic depth on PC.

Evil Has Awakened

It is the 24th century, and mankind has only recently begun expanding its reach to the star systems nearest our own Solar System.

A dark and terrible secret is buried within a misshapen moon nestled in the massive asteroid belt of the Epsilon Eridani system. Pythos colony was built there ostensibly to exploit the planetoid's mineral resources, but now they've disturbed a kind of evil that lurks beyond the fringes of our comprehension.

Through an ever-changing labyrinth, you will remold yourself into a cybernetic killing machine using the powerful technologies of a long-dead alien civilization. With these new-found weapons, you will pave a path of aberrant corpses toward the greatest threat to mankind ever encountered.

CTHON is an old school science-fiction first-person shooter, where you become a cybernetic weapon against the dark legions of a powerful evil entity - known only as Cthon - who lurks within the planetoid. It is a classic space horror game, inspired by the likes of Doom, System Shock, and Quake.
Features

  • Fight - and die - through nine sprawling randomly generated levels. No two games are ever the same, and permanent death ensures unrelenting tension.
  • Modify yourself with the cybernetic technologies of the ancients. A unique upgrade-powering system allows you to get down to the details of character building, and choose the stats you want, when you want, with millions of permutations. Mod types include defensive upgrades that can increase your physical strengths and offensive upgrades to maximize your firepower and grant new ways to exterminate your adversaries.
  • Slay an extensive array of monstrous creatures, each with intriguing tactical strengths and weaknesses. Battle corrupted humanoids, alien abominations, and biomechanical constructs as you delve ever deeper.
  • Use nano-tech currency to gain a strategic edge - access machines that can forge new items, replenish your resources, and expand your cybernetic framework.
  • Secret areas abound in the labyrinth; scour the levels for them and reap the rewards - and dangers - they may hold.
  • Choose one of three characters, each of them specialized toward different cybernetic builds.
  • Multiple difficulty levels allow you to adjust the nightmare world to your tastes.
  • A complex, haunting soundtrack complements the dark and oppressive atmosphere.
Interface:
EnglishFrench

Age rating

Unavailable
Metacritic:
tbd tbd
Steam:
Mostly Positive (84)

Minimum:

  • Processor: 2.5 GHz processor
  • Memory: 2 GB RAM
  • Graphics: 256 MB
  • DirectX: Version 9.0c
  • Storage: 500 MB available space

Recommended:

  • Processor: 2.7 GHz or faster processor
  • Memory: 3 GB RAM
  • Graphics: 1 GB
  • DirectX: Version 9.0c
  • Storage: 1 GB available space
Historical low
Price history from official stores
$4.99
Steam
1 years ago
Price history from keyshops
$168.71
G2Play
2 months ago

FAQ

9 questions

Before you start looking for a cheap CTHON PC key, check the essentials. Developed by Gravity Games. Published by Gravity Games. PC released date: 17 Mar 2017. Genres: Action. Categories: Family Sharing, Single-player.

Q

Where to buy a cheap CTHON Steam key or CD key?

Using our price comparison and verified discount codes, you can buy a CTHON key for as low as $4.99. This deal is available at Steam and is among the cheapest offers on the market. All keys listed on XD.deals are delivered digitally and eligible for instant download after payment. Prices already include processing fees and applied promo codes, so you always see the lowest CTHON price on PC. Check the CTHON price history to buy at the best moment.

As of our last update (we refresh Steam pricing multiple times a day), the CTHON Steam price is $4.99. You can save an extra ~6% by paying with a discounted Steam gift card.

Our price tracker covers both official retailers and key marketplaces, so you can find CTHON on sale even outside seasonal promotions. We currently detect 3 active offers from official stores and keyshops. Check the table above, compare against the historical low, and set an alert so you never miss the next price drop.

Based on our data, CTHON is not currently available on GeForce NOW. You will need to run it locally on your PC. Browse games available on GeForce NOW.

The cheapest offer came most often from Kinguin: 112 of 116 days with data. The current price is high against its own history: it was cheaper on 97% of days with data. The spread between offers was wide: from $4.99 to $200.05. We have been tracking this game since March 2, 2025 and collected 185 readings from 3 stores.

Yes. CTHON has an official page on the Steam Store. You can also buy a CTHON Steam key from third-party sellers. Our price comparison currently includes 3 offers with Steam DRM. Pick one to ensure your CTHON download happens on Valve's platform.

Not at this time. Valve marks CTHON as Unsupported on Steam Deck. Keep an eye on XD.deals - we track Proton updates and community fixes. Browse games that are Steam Deck Verified or Steam Deck Playable.

According to our data CTHON is not currently available on PC Game Pass, EA Play or Ubisoft+. We are still filling in the catalogues of these services, so it is worth confirming the status at the source before you decide. If you are buying, XD.deals will help you find the lowest price.

No - XD.deals is not a store. We are a price-comparison service that tracks the best CTHON deals across official stores and verified keyshops. Click "Go to Store" next to any offer and you will be redirected to the retailer's website to complete your purchase.

Best prices for CTHON

1 Steam Steam Official
$4.99
2 G2Play G2Play Keyshop
$199.41
3 Kinguin Kinguin Keyshop
$199.41

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