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Card GameIndieCasual by hogwartz.inc

Shin KoiKoi

Shin KoiKoi is a free polished version of the traditional Japanese card game Hanafuda Koi-Koi (花札こいこい). Built solo with Godot 4.6 .NET, it implements all 12 standard yaku with full Koi-Koi declaration logic, 3 AI difficulty levels (depth-4 search), an 18-tier ranking system, and a daily challenge mode. The game ships with 6 languages (Japanese / English / German / French / Spanish / Hindi) and full accessibility features (colorblind mode, 4 UI scales, reduced motion). Runs entirely offline with no ads, no microtransactions, and no tracking.

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Shin KoiKoi

Good for

  • Hanafuda fans frustrated with ad-laden mobile apps
  • Players who want accurate Koi-Koi rules with all 12 yaku
  • Non-Japanese players curious about hanafuda — full English/DE/FR/ES/HI tutorials
  • Anyone who values offline, ad-free, IAP-free single-player games

Avoid if

  • You expect online multiplayer at launch (planned for v0.2)
  • You want a mobile build today (Android beta in development)
  • You prefer animated 3D card games — this is clean 2D

Is Shin KoiKoi an indie game?

Yes. Shin KoiKoi's hand-entered genre tags include "Indie" (this entry is not on Steam), and its publisher is not on this site's major-publisher list.

  • Genre tags on record (entered by hand from the itch.io page; this entry is not on Steam): Card Game, Indie, Casual — includes "Indie".
  • Developer: hogwartz.inc.
  • Publisher: hogwartz.inc — same as the developer, i.e. self-published; not on this site's major-publisher list.

The rubric, its limits and the publisher list: methodology.