It is an application that you can play the card game "Poker".
The rule is 5 card draw, which is often played in Japan.

Deal five cards at a time, bet your chips, and change your hand. Bet the chips again and it will be a game. Winning or losing is decided by making a stronger hand (poker hand).

It also supports games that only exchange cards without betting chips. No chips to bet, but you can focus purely on making strong hands.

You can set Joker on or off. The Joker is a special card that can substitute for any other card. If you want to add Joker, please select "Yes" from the settings.

You can see the detailed rule explanation in the app.