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.

Last reviewed 2026-05-09

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About

A polished, free reimagining of the traditional Japanese card game Hanafuda Koi-Koi. 12 yaku, 3 AI difficulties, 6 languages, full accessibility. No ads, no IAP.

Games like Shin KoiKoi

Other traditional Japanese card games
Polished free single-player card sims
Hanafuda apps with offline play

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

FAQ

Is Shin KoiKoi worth playing in 2026?

If hanafuda fans frustrated with ad-laden mobile apps, Shin KoiKoi holds up well. Check "Avoid if" above for honest caveats before committing.

How long does Shin KoiKoi take to beat?

Main story runtime varies — check the HowLongToBeat link in the sidebar for community-reported hours (Main / Main+Extras / Completionist).