Game Overview
A mining colony on a warped moon becomes the setting for a bleak, fast-moving descent into cosmic horror. Set in the 24th century, CTHON places you in Pythos, an outpost in the Epsilon Eridani asteroid belt where industrial ambition uncovers something ancient and profoundly hostile. The result is an indie first-person shooter with a cold science-fiction surface and a Lovecraftian heart, trading heroic space opera for isolation, mutilation, and the fear of facing an intelligence no human mind is built to understand. Its mood is oppressive from the outset: steel corridors, alien ruins, and a shifting maze all reinforce the sense that the colony has become a trap.
Survival depends on pushing through an ever-changing labyrinth while fighting whatever the awakened presence sends after you. Gunplay remains the foundation, but the cybernetic transformation angle suggests that improving your body is as important as finding the next weapon or opening the next route forward. Each excursion asks you to navigate hostile spaces, manage the pressure of unpredictable layouts, and adapt your approach as new threats and upgrades reshape your capabilities. Rather than offering a carefully memorized campaign path, CTHON leans into uncertainty, making exploration part of the challenge and ensuring that progress feels earned through persistence as well as aim.
Its strongest draw is the collision of old-school FPS immediacy with a mutable, horror-driven structure. The shifting environment gives the colony more personality than a standard corridor shooter, while cybernetic alteration adds a fitting sense that survival comes at the cost of becoming less human. Fans of retro-styled shooters such as Quake, along with players who enjoy the oppressive sci-fi horror of System Shock, should find plenty to like in its grim atmosphere and direct combat focus. CTHON suits FPS veterans looking for a compact, punishing run through an alien nightmare, though newcomers should expect a harsher and more disorienting experience than a conventional story shooter.
Screenshots
Installation
- Select the Download button at the top of this page to open UploadHaven.
- On UploadHaven, wait for any countdown, then select Free Download. Optional: UploadHaven Pro for faster downloads.
- When complete, extract the archive to a CTHON folder using 7-Zip.
- Open the extracted folder and start the game normally.
- For errors, check Setup Guide & Troubleshooting below. Keep your security software enabled.
Setup Guide & Troubleshooting
How do I fix missing DLL errors for CTHON (v1.15d)?
After extracting CTHON (v1.15d), navigate to the _Redist or _CommonRedist folder inside the game directory and install DirectX, Vcredist, and any other dependencies included.
What should I do if the downloaded file is corrupted?
The full archive is 287.14 MB — make sure your download completed fully before extracting. Use 7-Zip to extract the files. If you still see a "file corrupted" error, re-download and try again.
Do I need to run the game as administrator?
Usually, no. Start the game normally from the extracted folder. If you see a permissions or save error, check that the folder is writable and follow the game's documented fix. Only grant administrator access when a trusted game's specific setup requires it.
How do I update my GPU drivers for this game?
The game won't launch — what should I try?
Check that extraction completed and your PC meets the system requirements. Note any error message before choosing a fix. If it identifies a missing runtime, install the required DirectX components or Microsoft Visual C++ Redistributable from Microsoft.
My antivirus is blocking the game — is it safe?
A warning needs to be investigated; the download source alone cannot confirm that a file is safe. Keep your security software enabled and review the detection details. Do not run or restore a flagged file unless you have verified that it is a false positive. If you are unsure, leave it quarantined.