How to Download HAL Protocol

1. Click on the HAL Protocol download button below.
2. Choose "Install" to install the game on the windows steam client.
3. Follow the on-screen prompts
4. Let it download the Full Version.
5. Once a game is downloaded, use the Windows Steam Client to play the game.

=== Download Game ====

Download for pc →

This guide describes how to use Steam Proton to play and run Windows games on your Linux computer. Some games may not work or may break because Steam Proton is still at a very early stage.

1. Activating Steam Proton for Linux:
Proton is integrated into the Steam Client with "Steam Play." To activate proton, go into your steam client and click on Steam in the upper right corner. Then click on settings to open a new window. From here, click on the Steam Play button at the bottom of the panel. Click "Enable Steam Play for Supported Titles."

Alternatively: Go to Steam > Settings > Steam Play and turn on the "Enable Steam Play for Supported Titles" option.

Valve has tested and fixed some Steam titles and you will now be able to play most of them. However, if you want to go further and play titles that even Valve hasn't tested, toggle the "Enable Steam Play for all titles" option.

2. Choose a version
You should use the Steam Proton version recommended by Steam: 3.7-8. This is the most stable version of Steam Proton at the moment.

3. Restart your Steam
After you have successfully activated Steam Proton, click "OK" and Steam will ask you to restart it for the changes to take effect. Restart it. Your computer will now play all of steam's whitelisted games seamlessly.

4. Launch Stardew Valley on Linux:
Before you can use Steam Proton, you must first download the Stardew Valley Windows game from Steam. When you download Stardew Valley for the first time, you will notice that the download size is slightly larger than the size of the game.
This happens because Steam will download your chosen Steam Proton version with this game as well. After the download is complete, simply click the "Play" button.

Windows Pc Requirements

Minimum:

• Requires a 64-bit processor and operating system
  
• OS: 10+
  
• Processor: i5-6600 or equivalent
  
• Memory: 8 GB RAM
  
• Graphics: GTX 1060 or equivalent
  
• DirectX: Version 11
  
• Storage: 5 GB available space

Recommended:

• Requires a 64-bit processor and operating system

Linux Requirements

Minimum:

Recommended:

Mac Requirements

Minimum:

Recommended:

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.

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?

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