Written by Mielczarek Art
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.
Save the planet SU-42 and join the fight! 🚀🔥 SU42: HIRED GUN is a fast-paced 2D shooter inspired by 80s/90s games! Choose two out of eight mercenaries and switch between them in battle. Enjoy hand-painted graphics, giant robots, a synth-wave soundtrack, explosions, and lasers!
Indie game made by a husband and wife from Poland
Play Solo or Co-Op with friends
Steam Remote Play. Invite your friends to your virtual couch
Steam Remote Play TV. Play on your TV.
Choose your two heroes and switch them during the fight
Your playstyle depends on the heroes you choose
This isn’t just mindless mayhem—enemies adapt to your tactics
Colorblind-friendly: Protanopia, Deuteranopia, Tritanopia

It all started with a sketch of one of the characters.

Over time, more ideas emerged, until my wife and I turned it all into a concrete game project. I’ve been working in game development for years and thought, “What if I made and released a game myself? One that I want to make, not one a client demands.” Something from a gamer, for gamers. That’s how SU42: Hired Gun came to be—a classic side-shooter packed with action and tactics, offering varied gameplay depending on the chosen characters or on-screen situations.
SU42: Hired Gun is designed to be an enjoyable game with classic gameplay but in a modern package. Plus, it’s meant to be accessible to everyone—no Early Access, just a full game available for 5$. It’s all about delivering good fun!


You are a member of the elite USHF - United System Hired Forces, stationed aboard the star cruiser ORP "Dragon". The "Dragon’s" mission is to patrol the local system and serve as a deterrent to space pirates.

During the journey, the crew is in hibernation—eight members (or maybe more...), and the ship is managed by the AI system "Mother." Mother receives an S.O.S. signal from the nearby planet SU-42, which an unknown cybernetic lifeform has invaded. Your task is to destroy and drive out the invaders.

The cybernetic race is abducting the population and animals of SU-42, loading them onto gravi-trains. These trains transport their cargo to a hidden Hive Ship. Your mission is to seize the trains, gather intel on the Hive Ship’s location, and then destroy it.
Take control of 4 trains operating in diverse climates—from deserts to jungles.
Each train’s onboard computer is guarded by a unique Boss and Mini-Boss.

Fighting on the trains isn’t just endless running to the right. Sometimes you need to stop, make a decision, or even backtrack to a previously locked passage.
On the fifth and final level, you’ll face the massive Hive Ship, an army of the cyber race, and deadly bosses.
But before you can stop a train, you have to reach it first. Here, the game pays homage to MDK with a flight sequence from orbit to the planet! Dodge projectiles and collect power-ups that will be available once you land on the train.

You have eight mercenaries at your disposal, each differing in speed, attack, special abilities, and more.
You can take two mercenaries into battle: one stays in the Combat Drop Ship while the other fights on the train. If needed, you can swap them at any moment. This changes the gameplay style, and the mercenary on the ship can heal their wounds.

Hand-painted graphics
Retro pixel art vibe with a modern twist
Tactical gameplay with character swapping mid-game
Unlockable characters with new abilities and weapons
Enemy AI reacts differently to player behavior— it won’t just mindlessly charge at you, though it likes to do that too.