Written by Mathieu Bekkaye
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 card battle game inspired by Final Fantasy VIII’s Triple Triad. Select 5 cards and place them on the Grid. Flip opponent cards to win, collect them, and progress through the story. Defeat the Devil to earn his soul card and complete the campaign, or play with custom rules in Freeplay mode.
The Devil Card is a solo versus card battle game played on a 3×3 grid, inspired by Final Fantasy VIII’s Triple Triad.
Each match begins with you selecting five cards from your collection. Each card has four numeric values, one on each side, which determine its strength against adjacent cards. You take turns placing cards on the 3×3 Grid. When a card is placed next to an opponent’s card, the numbers on the touching edges are compared. If your card’s value is higher, the opponent’s card is flipped and changes color to indicate which side currently owns it.
Battles are played over two rounds, with all nine grid cells filled each round. At the end of a round, the side controlling the most cells wins that round. In case of a draw, the round is replayed and no side is awarded the win. Winning both rounds allows you to choose one card from your opponent’s deck to add permanently to your collection. This process repeats across the campaign, gradually expanding your deck and enabling more complex strategies in later battles.
Each opponent in the campaign can use a unique combination of official rules. The game includes the following rulesets:
Open: All cards are visible from the start.
Random: Card positions are shuffled at the beginning of each round.
Mirror: Cards with the same values touching each other are flipped.
Plus: Cards are flipped when the sum of adjacent values matches another sum on the board.
Combo: Flipped cards may trigger further flips in chain reactions.
MirrorWalls: Functions like Mirror, but board edges act as A walls.
Elemental: Cards have elemental types, with strengths and weaknesses influencing flips.
Each battle’s rules are clearly visible before the match starts, and in Freeplay mode, you can enable any combination to practice or create custom challenges.
The Campaign mode tells a linear story in which you face 25 unique opponents.
Each opponent uses their own set of rules, keeping battles varied and challenging you to adapt your strategy each time.
By winning duels, you unlock cards from your opponents’ decks, gradually expanding your collection.
There are over 300 unique cards to collect in total, so completing your collection may require multiple battles and careful strategic choices.
As you progress, you learn to master the different rules and build increasingly effective strategies to tackle tougher challenges.
Your ultimate goal is to defeat the Devil, earn his soul card, and complete the campaign.
In Freeplay mode, you can use all the cards unlocked in the campaign and freely configure the rules for your battles.
This mode does not affect the story’s progression and is ideal for testing strategies, experimenting with rule combinations, or simply playing at your own pace.
Over 300 unique cards to collect
25 opponents in a linear story campaign
Battles played over two rounds with numeric values determining flips
Multiple rulesets for strategic depth
No card loss — collection grows with every win
Freeplay mode for custom battles and practice
Family-friendly fantasy theme with no violence
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