Battle Hanafuda is a video game based on the traditional Japanese card game Hanafuda.
Experience the depth and fast-paced excitement of Hanafuda with maximum accessibility and ease of play.
Key Features
Supports both Koi-Koi, the most popular Hanafuda rule set, and the thrilling gambling-inspired game Oicho Kabu.
Designed so that even complete beginners can enjoy Hanafuda from their very first match.
Features such as hand highlights, automatic card recognition, and intuitive visual guidance help you learn naturally while playing.
Easily see when you're just one card away from completing a scoring hand and enjoy the excitement of strategic decision-making.
Supports Online Multiplayer.
Differences Between the Full Version and the Demo
In addition to everything included in the demo, the full version includes:
Online Multiplayer (always available)
Arcade Mode
Watch Mode (spectate AI vs. AI matches)
Hard Mode (challenge a stronger AI)
No-Sake Mode (CPU matches with the Sake Cup card disabled)
Oicho Kabu
Steam Achievements
Steam Leaderboards
Steam Cloud Saves
Mouse and Steam Deck touch input support
Music Room
In-game rule reference for both Koi-Koi and Oicho Kabu
Arcade Mode Beta (Currently in Development During Early Access)
A stage-based single-player mode.
Earn money by winning matches and spend your funds to continue after defeat.
Manage your resources carefully and aim to clear all stages.
Current Beta Content: Stages 1–3 are available.
Free Play Mode
Play the following games:
Koi-Koi (Nintendo-style rules plus an optional No-Sake variation)
Oicho Kabu
Detailed rules for each game can be viewed from the in-game Configuration menu.
Watch Mode (AI vs. AI Spectator Mode)
Watch matches between the Normal and Hard AI.
Recent match logs can be viewed in watch.log inside the save directory via Steam's Browse Local Files option.
The log contains various metrics showing why the Hard AI selected each move.
You might even enjoy analyzing watch.log using generative AI tools.
Note: The Hard AI is still being refined and will continue to receive improvements throughout Early Access.
We welcome feedback and analysis from the community.
Online Multiplayer
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.
Music Room
The game's soundtrack is powered by the YM2612 (OPN2) sound chip used in the VGS-X platform.
The Music Room allows you to preview tracks while viewing a piano-style keyboard display.
Recommended For
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
Content Usage Policy (Streaming & Media)
You are free to create and publish content using this game (including gameplay videos, live streams, articles, social media posts, and fan works / derivative works) without obtaining prior permission.
This applies to both commercial and non-commercial use, including monetized content.
However, redistribution or reuse of in-game assets (such as graphics, audio, or music files) as standalone materials is not permitted.
Credit Example: Battle Hanafuda © 2025-2026 SUZUKI PLAN
