OneCard is a popular card game that can be played by 2 to 5 players. The goal of the game is to be the first person to put down all the cards. The game is played in turns where each player can only put down a card with the same shape or number as the one previously played. If a player cannot put down a card, they must pick up a card from the deck.

OneCard has a variety of features that make it both fun and challenging. Players can set the number of players and the number of start/bankruptcy cards in the game settings menu. The game also has attack cards with cumulative effects, such as the 2, A, Spade A, Black Joker, and Color Joker. Special cards such as the 3, 7, J, Q, and K add an extra layer of strategy to the game.

It's worth noting that there are countless local rules for OneCard, so not all rules may be accepted. However, the game is still highly enjoyable and challenging for players of all skill levels.