Written by Dori Studios
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.
A 3D platformer where CU tries to reunite his clumsy friends PI and ES while navigating a world full of absurd dangers and “design choices” that test your sanity. Free, chaotic, and surprisingly challenging.

A world that seemed normal… until someone contaminated all the water and turned it pink and deadly. Since then, everything has been placed in suspiciously unfriendly ways: impossible platforms, unfriendly creatures, and heights that definitely break every safety regulation imaginable.

CU does all the hard work. PI and ES… well, they’re more into “standing still.” They’re scattered across each level in very inconvenient places, and your job is to bring them together to unlock walls, activate mechanisms, and open the portal to the next stage. Simple in theory, trap-filled in practice.
The journey starts gentle, almost innocent, but soon you’ll be whispering to yourself:
“Seriously… who thought this was a good idea?”
And while you question everything, the game quietly smiles at you. It’s pretty, yes, but in that kind of beauty that watches you fall for the fifth time.
Get ready to fall, fail, retry, and fall again. There are no checkpoints for CU, and the dangers are crafted with a suspicious mix of cruelty and humor.
It’s free… but your patience might need therapy.
⚠️ A world full of “creative” traps
Badly placed paths, ridiculous jumps, absurd heights, and deadly pink water. Very safe… depending on who you ask.
🧊 Simple controls, not-so-simple characters
CU moves; PI and ES wait like the most adorable clumsy figurines in existence. Bringing them together is essential, even if they don’t help at all.
🧊 CU: the only one who moves… barely
Help CU survive suspicious jumps, annoying enemies, and highly questionable design choices. He’s the smartest of the group, but don’t get excited—he’s still a hopeful little clumsy mess.
🧊 PI & ES: the clumsy duo of the year
Two adorable statues fully dependent on you. Bringing them together is always a challenge, even though they do absolutely nothing.
💧 Deadly contaminated water
Touch it and you'll restart your life, your progress, and your faith in humanity.

🔄 Retry. Retry. Retry.
No checkpoints for CU. A reminder to appreciate life. Every mistake is 100% yours… even if the game doesn’t help.
🎨 A simple look that gets weirder over time
Friendly at first, but each level becomes stranger, more twisted, and more “why is this even here?”
🎮 Completely free
Just like the old days: download it, play it, suffer a little. Remember to breathe between attempts.
🎮 Controller or keyboard
Choose your weapon. The controller is calmer; the keyboard… louder when you hit it.
A game by Dori Studios. Welcome to CUPIES.
