Battle Hanafuda

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• Announcements·12 Aug 2026Official

  Version 0.36: Custom KoiKoi Rules in Online Battles

  This update lets the room host configure rules equivalent to Custom KoiKoi when creating a Private Room in Online Battle.Other Match Types Keep Their Existing RulesOnline matches outside Private Rooms (Quick Match / Friends Match) will continue to use the following fixed rules:Rounds = 4Hand Cards = 8Field Cards = 8Hanami/Tsukimi = 5ptsKoiKoi Calls = OnceKoiKoi Scoring = StandardNetwork CompatibilityThis update changes the network protocol used for online play.As a result, Battle Hanafuda Version 0.35 and earlier cannot play online with Version 0.36 and later.If matchmaking does not complete successfully, please make sure both players have updated Battle Hanafuda to Version 0.36 or later.
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• Announcements·8 Aug 2026Official

  Version 0.35: Customizable Keyboard Mapping (keymap.ini)

  This update adds customizable keyboard mapping.If you prefer WASD controls or use a Dvorak keyboard layout, give it a try!Where keymap.ini is savedAfter updating and launching the game, a keymap.ini file is automatically created in the game's installation directory. To open this directory, right-click the game in your Steam Library and select Manage → Browse local files.Edit keymap.ini to change the keyboard mappings.Configuration formatkeymap.ini defines one keyboard mapping per line in the format BUTTON = KEY.BUTTON valuesBUTTONDescriptionUPUp on the directional padDOWNDown on the directional padLEFTLeft on the directional padRIGHTRight on the directional padAA button (confirm)BB button (cancel)XX button (auxiliary button 1: fast-forward, etc.)YY button (auxiliary button 2: scoring-combination list, etc.)STARTSTART buttonKEY valuesKEYDescriptionA-ZLetter keys (A-Z)SymbolAn ASCII punctuation character that can be typed without a modifier keyUpUp Arrow keyDownDown Arrow keyLeftLeft Arrow keyRightRight Arrow keyEnterEnter keyReturnEnter keyEscapeEsc keyEscEsc keyTabTab keySpcSpacebarSpaceSpacebarLShiftLeft Shift keyRShiftRight Shift keyNotesBUTTON and KEY names are case-insensitive.Number keys, function keys, and characters that require modifier keys cannot be assigned.KEY values follow the active keyboard layout; they do not refer to physical key positions.After leading spaces and tabs are removed, lines beginning with ; are ignored as comments.A semicolon can still be used as a KEY value (example: B = ;).To restore the default mappings, delete keymap.ini and launch the game again.Default configuration; Keyboard mappings use BUTTON = KEY. Button names and key names are case-insensitive.; Buttons: UP, DOWN, LEFT, RIGHT, A, B, X, Y, START.; Keys: A-Z, an unmodified ASCII punctuation character, up/down/left/right,; enter/return, esc/escape, tab, spc/space, lshift, or rshift.; Number keys, function keys, and characters requiring modifiers are not supported.; Values foll...
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• Announcements·6 Aug 2026Official

  Version 0.34: KoiKoi - Custom

  We have added a new game mode, "KoiKoi - Custom," which lets you customize the rules of Koi-Koi.SettingsSettingDescriptionAISelect your opponent's AI behaviorRoundsSelect the number of roundsHand CardsSelect the number of cards in each player's starting hand (6/8/10)Field CardsSelect the number of cards in the starting field:When Hand Cards is not set to 10: 6/8/10/12When Hand Cards is set to 10: 6/8Hanami/TsukimiSet the points awarded for the sake yaku (Hanami-zake and Tsukimi-zake)5pts: Standard rules3pts: Reduced points0pt: Disable these yakuKoiKoi CallsSet how many times Koi-Koi may be called:Once: Once per round (standard rules)Multiple: Any number of times per roundKoiKoi ScoringSet the scoring bonus applied when Koi-Koi is calledStandard: If a player calls Koi-Koi and then loses the round, the opponent's score is doubled (standard rules)Rising Stakes: Each Koi-Koi call increases the score multiplier for both playersSpecial Combination (Multiple + Rising Stakes)When KoiKoi Calls is set to "Multiple" and KoiKoi Scoring is set to "Rising Stakes," each Koi-Koi call increases the score multiplier to 2x (first call), 4x (second call), 8x (third call), and up to 16x (fourth call).If the double-score rule for scores of 7 points or more also applies, the score multiplier can reach a maximum of 32x.A single yaku can be worth more than 200 points, making for a thrilling match.The "Multiple + Rising Stakes" combination is generally best suited to shorter matches.You can also use it in longer matches, but they may take considerably more time to complete.
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• Announcements·30 Jul 2026Official

  We're Considering a Customizable Koi-Koi Rules Mode

  We're currently considering adding a new game mode, "KoiKoi - Custom," that will let you customize the rules of koi-koi.The customization options currently under consideration are:Opponent difficulty: Normal / HardNumber of rounds: 2 / 4 / 6 / 12Cards in the starting hand: 6 / 8 / 10Cards on the table at the start: 6 / 8 / 10 / 12 (6 or 8 when starting with 10 cards in hand)Sake yaku score: 5 points / 3 points / Disabled (0 points)Koi-koi declarations: Once (one declaration only) / Multiple (multiple declarations allowed)Koi-koi scoring: Standard (if the player who was called against wins, their score is doubled) / Rising Stakes (the winner's score is doubled, regardless of who declared koi-koi)When Rising Stakes and Multiple are combined, we're considering a rule where the multiplier increases with each koi-koi declaration: ×2 → ×4 → ×8 → ×16, capped at ×16 from the fourth declaration onward.This feature is not planned as paid DLC. We plan to release it as a free update for everyone who owns Battle Hanafuda. Development is underway, with an early August release as our target.
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• Patch Notes·16 Jul 2026Official

  Version 0.33

  This update applies only to the macOS and Linux versions. On these platforms, the game uses SDL2 to render a 640×400 texture to the screen at 60 FPS. We discovered that the texture buffer (framebuffer) was incorrectly allocated for only 399 rows (640×399), and have fixed the issue. This bug could cause crashes and other problems. We believe this update resolves them, but since we do not have access to hardware on which the issue can be reproduced, we cannot guarantee that the fix is complete. If you encounter any further issues, we would greatly appreciate it if you could report them on the Community forum.
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