I built a free online version of Hanafuda Koi-Koi — the card game Nintendo was founded to make
Hey r/cardgames. Anyone here play Hanafuda?
Before Mario, before Game Boy — Nintendo was founded in 1889 to manufacture Hanafuda, Japanese flower cards. The most popular game played with them is called Koi-Koi, and I got hooked on it a couple years ago. I couldn’t find a good online version to play when I didn’t have my physical deck handy, so I ended up building one.
For those who haven’t heard of it: Koi-Koi is a two-player card game using a 48-card deck with 12 suits representing the months of the year. You match cards by month, capture pairs, and try to build scoring combinations called yaku. The twist: when you complete a yaku, you can stop and bank your points, or call “koi-koi” to keep playing for more — but if your opponent scores first, you lose everything.
It’s simple enough to learn in 5 minutes but has real strategic depth once you start tracking what your opponent is collecting and deciding when to push your luck.
The game has:
• Ranked online matchmaking
• AI opponents (4 difficulty levels)
• Private rooms to play with friends
• 15 deck designs based on real regional Japanese patterns
• Interactive tutorial for complete beginners
Free, browser-based, no download: https://www.hanafudalegends.com
Would love to hear from anyone who plays Koi-Koi or other Hanafuda games — I want to make the game even better.