Koikoi is a free Android game developed by Googolplex ltd. It is a Hanafuda game, which is a traditional Japanese card game. The game is played by throwing cards on the table alternately and collecting matching cards. If your cards are flush, you get a point and can continue playing. The game ends after 12 rounds and the winner is the player with the most points. The game's record is saved automatically, allowing you to keep track of your progress.

Koikoi is an easy-to-play game that is perfect for anyone who loves card games. The game's interface is simple and user-friendly, making it easy to navigate. The game's graphics are also well-designed, with vibrant colors and high-quality images. Overall, Koikoi is an excellent choice for anyone who is looking for a fun and engaging card game to play on their Android device.