Hanafuda is a Japanese card game played with 48 cards: 12 months, 4 cards per month. Koi-Koi is its most popular way to play. Match cards of the same month and make yaku (scoring combinations).
Hanafuda is said to have been born in Japan in the Edo period. Its cards are known for beautiful pictures of seasonal flowers and animals, and Koi-Koi is still widely played today.
Each player is dealt 8 cards, and 8 cards are placed face up on the field. On your turn, play a card from your hand that matches a field card's month, take both, then draw a card from the deck and match it the same way if possible.
When you make a yaku, you can stop and score (agari), or continue with Koi-Koi. If you choose Koi-Koi, the next agari is doubled — but if your opponent scores first, you get nothing.
The cards show artwork only, yaku are judged automatically, and you can play matches of 3, 6, or 12 rounds.