Written by Mariani Games
Table of Contents:
1. Screenshots
2. Installing on Windows Pc
3. Installing on Linux
4. System Requirements
5. Game features
6. Reviews
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.
Operation Ninurta is a third-person tactical shooter with roguelike elements. Explore an infinite procedural maze on Eris, face mutants and bosses, find three crystal keys, and reactivate the portal to win. With limited ammo, upgrades, and warped realities, strategy is vital.
Operation Ninurta – Eris Portal is a third-person tactical shooter with roguelike elements, set in the near future, where Earth soldiers are sent on solitary missions through spatial portals. You are the next to cross... Your destination: Eris, a dark planetoid on the edge of the Solar System, marked by signs of alien presence and structures that defy the known laws of physics.
The operation was created by LEAP — Laboratory for Advanced Portal Studies — after the discovery of archaeological artifacts containing coordinates to ancient portals hidden among celestial bodies. However, current technology allows only one traveler to cross every 40 hours. This limitation led to the formation of a special unit: elite soldiers trained for solitary missions in unknown territories.
Your mission is clear: investigate Eris, find three crystal keys that power the portal structure, and use them to reactivate the connection back to Earth. But the task quickly proves more dangerous than anyone expected. The planetoid holds a maze of interconnected hexagonal rooms — a system that, at first glance, seems to obey the rules of three-dimensional space.
However, as you pass through these doors, you soon realize something is wrong. The topology of the maze follows a logic based on the six-faced hypercube theory, where time is treated as a physical dimension. This means entering a room through one door and trying to return through it won’t take you back to where you came from. Each movement alters space in unpredictable ways. There is no easy return. Moving forward is your only choice.
While exploring the facility and searching for the keys, you'll face mutant creatures — life forms genetically manipulated by ancient alien civilizations. These unarmed enemies pose no direct threat, but they move in groups, act erratically, and are used to distract your attention. Their role is simple and cruel: create chaos and open space for the real danger.
Armed enemies appear randomly as you progress. They are lethal, and both their presence and quantity are carefully controlled by a system of increasing difficulty. Every 20 levels, a new Boss enters the scene — each with their own abilities and combat style. Defeating a Boss is not just a matter of survival: it unlocks new enemies that are added to future spawn calculations, making each run more challenging than the last.
The game’s structure was designed to emphasize strategic decision-making. The player starts with limited ammunition, and every shot must be calculated. Excessive firing can leave you defenseless even in the early rooms. But there is a way to adapt: when you die, your score is preserved and can be used to acquire extra magazines for the next mission. Over time, you'll learn to conserve resources, anticipate patterns, and survive deeper into the maze.
Even so, time remains your greatest enemy. The longer you stay on Eris, the more unstable your presence becomes. Returning grows increasingly uncertain. Each attempt is a struggle against creatures, the environment, scarcity, and the very structure of reality. There is no fixed map. No known path. Every player will have their own journey.
On Eris, there are only two ways for the game to end: either you die, or you manage to find the return portal, activate it, and make it back to Earth. How long will that take? It’s up to you. As long as you’re alive, Eris will try to crush you — until you finally succumb. It may last hours... or days in this agony.
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