Hanafuda KOI KOI Free is a traditional Japanese card game developed by Threshold.jp. This game is a way to play Hanafuda, a Japanese playing card game, with two players. The objective of the game is to make combinations of several cards before your opponent. The game offers both single and multi-player modes, including Wi-Fi, Bluetooth or Internet play with friends.

Players can also enjoy online multiplayer, leaderboards, and achievements with Google+ sign-in. In case of encountering any errors, the developers request that users send detailed information including device name and app version to help solve bugs.

Overall, Hanafuda KOI KOI Free is a fun and engaging game that offers a unique traditional Japanese experience to players.