Koi-Koi (こいこい) is a PalmOS game published in 1999 by Palm Boarderz.
It was developed by Keisuke Mitani.
5 round game
The player with the highest total score after 5 rounds wins. Let’s try to get a high score!
200 sentence game
The first player to reach the 200-point mark wins. The higher the score, the higher the minimum sentence value required to win.
It’s going to get harder and harder, but keep at it!
Tug-of-war game
This is a game in which you hold 30 sentences each at the beginning, and when the game is over, you take sentences from the loser. Goal is to reduce the opponent to 0 sentences. However, if the game is not won within 10 rounds, it is a draw. Try to beat your opponent as quickly as possible.
Role-limited game
The winner is the first player to five rounds, with the only restriction being that the player must collect the specified yaku. Try to get a high score by playing high yaku.