Full game metadata
| Field | Value |
|---|---|
| Steam app type | game |
| Steam App ID | 3726440 |
| Live current players | 0 |
| SteamPulse tracked peak | 1 |
| Live count (today's peak floor) | 0 |
| Price | $4.99 |
| Free to play | No |
| Discount | 0% |
| Original price USD | $4.99 |
| Current price USD | $4.99 |
| Release date | Jun 23, 2025 |
| Developer | The Last Semicolon Dev |
| Publisher | The Last Semicolon Dev |
| Owners estimated | Not available |
| SteamSpy owner estimate minimum | Not available |
| SteamSpy owner estimate maximum | Not available |
| Review type | 1 user reviews |
| Positive review percent | 100% |
| Positive reviews | 1 |
| Negative reviews | 0 |
| Total reviews | 1 |
| Steam recommendations | Not available |
| Achievements | 2 |
| Average playtime forever | Not available |
| Windows support | Yes |
| macOS support | No |
| Linux support | No |
| Parent game | Not available |
| Store URL | https://store.steampowered.com/app/3726440/ |
Short description
Your shift aboard the HIS 01 Echo is finally over. The return shuttle awaits you in Compartment 9. All that's left is to walk there. But the corridor to Compartment 9 loops endlessly. Each time, something shifts. Uncover the mystery. Escape the impossible.
About this game
Something is wrong aboard the HIS 01 Echo. Your shift is over. The return shuttle awaits you in Compartment 9. All you need to do is walk there… but the corridor keeps sending you back to the beginning. A loop with no end. At first glance, everything seems familiar — but look closer. With each cycle, something changes : a missing object, a wall in a different spot, equipment moved across the hall. The anomalies aren’t tiny — but they won’t always stand out. Spotting them is the only way forward. HAL Protocol is a first-person narrative experience focused on observation, memory, and intuition. No enemies. No jumpscares. Just you, the ship, and a looping mystery to unravel. There is no time limit. Take your time, explore at your pace, and move forward only when you're sure. If something’s off, turn back. If everything looks right, proceed. Choose wrong, and the loop resets. Can you break the cycle? Or will you remain trapped in the quiet heart of the ship?
Supported languages
English