Written by SUZUKI PLAN
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 strategic two-player card battle based on the traditional Japanese game Hanafuda. Learn as you play and enjoy thrilling “Koi-Koi” duels filled with risk and reward.
Experience Koi-Koi, the most popular rule set of the traditional Japanese card game Hanafuda, reimagined as a fast-paced, strategic two-player battle.
Even if you’ve never played Hanafuda before, this game is designed to guide you naturally through your first match.
Highlighted card options, automatic capture suggestions, and intuitive visual cues ensure you always understand what you can do—and how close you are to completing a powerful yaku (scoring hand).
With a single button, you can check the full list of hands at any time.
Enjoy the depth of Hanafuda with the smoothest, most accessible experience possible.
In addition to everything included in the demo, the full version includes:
Always-available Online Multiplayer
Watch Mode (spectate AI vs. AI matches)
Steam Achievements (including unlocks for specific winning hands)
Steam Leaderboards (view top players’ match results)
Steam Cloud Saves
In the current Early Access version, we’re considering the following features for future updates:
More advanced and strategic AI matches (Hard Mode improvements) *Current scope
Story Mode / Arcade Mode, aiming for an ending *Under consideration (details and priority TBD)
Note: Plans may change based on development progress and community feedback.
Quick Match
Match with a random opponent online.
Friends Match
Match online with players on your Steam Friends list.
Create Private Room
Create a private room using a custom ID and invite other players to join.
(Share the room ID via chat or other means.)
Join Private Room
Join an existing room by entering its ID.
Log
View the results of your last 12 online matches and check your opponents’ Steam profiles.
A Private Room ID is created by choosing any 6-character code.
During online matches, to maintain a fast-paced experience, the pause function and hand list are disabled, and all inputs are subject to a time limit.
In Watch Mode, you can spectate AI vs. AI matches between Normal and Hard.
You can also check the most recent match log by selecting “Browse Local Files” in Steam, then opening `watch.log` under the `save` directory.
`watch.log` includes various metrics showing why the Hard AI chose each move.
It might be fun to have a generative AI analyze `watch.log`.
Note: The Hard AI is still being tuned and improved (we plan to keep updating it throughout Early Access). Please feel free to share your feedback and findings with the community.
Faithfully follows the official “Koi-Koi” rules used in tournaments and by Nintendo
All cards show their month (1–12) and point value (20 / 10 / 5 / 1) in Arabic numerals
Designed so even beginners can quickly understand the gameplay
Strategic and thrilling matches with risk-reward “Koi-Koi” doubling mechanics
Hanafuda (花札) is a traditional Japanese playing card game derived from naipes, a type of card introduced from Portugal in the 1540s.
The deck consists of 12 suits representing the months from January to December, for a total of 48 cards.
Each month has four cards, divided into the following four categories:
Bright (Hikari-fuda) — 20 points, 5 cards in total. The highest-scoring cards.
Animal (Tane-fuda) — 10 points, 9 cards showing animals or objects.
Ribbon (Tanzaku-fuda) — 5 points, 10 cards featuring poetic ribbons.
Chaff (Kasu-fuda) — 1 point, 24 cards showing small background motifs.
Among the Ribbon cards:
Those from January, February, and March are called Red Ribbons (Aka-tan) — red ribbons with writing.
Those from June, September, and October are called Blue Ribbons (Ao-tan) — blue ribbons without text.
Hanafuda is also known as Hana-karuta or Hana-koppai (literally “flower cards”).
Interestingly, Nintendo, originally founded in 1889 as Nintendo Koppai, began as a Hanafuda card manufacturer —
a fascinating piece of history showing how deeply these traditional cards are woven into Japanese culture.
Koi-Koi is a two-player duel that blends elements of poker and mahjong.
The game begins with 8 face-up table cards, 8 cards dealt to each player,
and a remaining deck of 24 cards.
Players (dealer and opponent) take turns playing one card from their hand.
If it matches the same month as a card on the table, both cards are captured.
If not, the played card is discarded onto the table.
Then, the player flips the top card of the deck and captures or discards it in the same way.
These steps are repeated alternately until both players run out of cards.
When a scoring hand is completed with captured cards, the player may choose either to “Finish” (end the round) or declare “Koi-Koi” to continue.
If you declare Koi-Koi and your opponent completes a scoring hand afterward, the round immediately ends: your opponent’s score is doubled, and your score for the round becomes zero.
If your completed hand is worth 7 points or more, your score for the round is doubled.
Furthermore, if your opponent has declared Koi-Koi and you win with a 7-point (or higher) hand, the score is quadrupled.
Official matches consist of 12 rounds, and the player with the higher total wins.
In this game, you can also choose from four match-length modes:
Very Short (2 rounds)
Short (4 rounds)
Half (6 rounds)
Full (12 rounds)
Koi-Koi offers deeper strategy than poker while remaining much simpler than mahjong — making it a balanced game that sits comfortably between the two.
There is naturally some correlation between strategic depth and rule complexity.
Koi-Koi is slightly more intricate than poker, but that added complexity createsa rewarding layer of decision-making that greatly affects the outcome of each round.
For example, if you declare Koi-Koi while holding five Animal cards (Tane), and later capture a sixth, this counts as completing an additional scoring hand.
After a new hand is completed during Koi-Koi, you are required to end the round immediately.
Rules like this add nuance to the game while giving skilled players more room to outthink their opponent.
To keep the experience approachable, this game streamlines such detailed rules through clear visual guidance and controlled flow, making Koi-Koi intuitive even for newcomers while preserving its strategic depth.
Press Y (or △ / S key on keyboard) during play to check the full list of hands anytime.
Cards you have already captured are highlighted in the list,
making it easy for beginners to see which cards they still need to complete a hand.
1. Gokō (Five Brights) — 10 pts
All five Bright cards.
Cancels Shikō and Sankō.
2. Shikō (Four Brights) — 7 or 8 pts
Four Brights.
7 pts if includes Willow (November), otherwise 8 pts.
Cancels Sankō.
3. Sankō (Three Brights) — 5 pts
Three Brights excluding Willow (November).
4. Hanami de Ippai (Cherry Blossom Viewing with Sake) — 5 pts
March Bright (cherry blossom) + September Animal (sake cup).
5. Tsukimi de Ippai (Moon Viewing with Sake) — 5 pts
August Bright (moon) + September Animal (sake cup).
6. Inoshikachō (Boar-Deer-Butterfly) — 5 pts + bonus
June, July, and October Animals.
+1 pt for each extra Animal (max 12).
Cancels “Animal Set”.
7. Animal Set — 1 pt + bonus
5 or more Animal cards.
+1 pt for each additional. (e.g., 7 Animals = 3 pts)
8. Red & Blue Combo — 10 pts + bonus
All three Red Ribbons + all three Blue Ribbons.
+1 pt per extra Ribbon (max 13).
Cancels Red, Blue, and Ribbon Set hands.
9. Red Ribbons — 5 pts + bonus
All three Red Ribbons.
+1 pt per extra Ribbon.
Cancels “Ribbon Set”.
10. Blue Ribbons — 5 pts + bonus
All three Blue Ribbons.
+1 pt per extra Ribbon.
Cancels “Ribbon Set”.
11. Ribbon Set — 1 pt + bonus
5 or more Ribbon cards.
+1 pt per additional.
12. Plain Set — 1 pt + bonus
10 or more Chaff cards.
+1 pt per additional.
Note: The Sake Cup (September Animal) also counts as Chaff.
A / × / Z key — Play a card / Confirm
B / ○ / X key — Cancel / Go back
X / □ / A key — Fast-forward animations
Y / △ / S key — Show hand list
Menu / Options / SPACE key — Pause the game
Ctrl + R key — Reset Program
Ctrl + Q key — Exit Program
Beginners who’ve always wanted to try Hanafuda
Players looking for a quick, two-player battle game
Fans of Japanese-style, strategy, and mind-game experiences
People who enjoy tabletop games like poker or mahjong
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