One Card

You

Record vs AI

A 52-card deck plus 2 jokers. Everyone gets 7 cards.
Play one card that matches the top card in suit or rank. If you cannot (or do not want to) play, draw 1 card.
Empty your hand first to win! If your hand reaches 20 cards, you go bust and lose.

Attack: a 2 makes the next player draw 2, an A draws 3, the ♠A draws 5, the black joker draws 5 and the color joker draws 7.
When attacked, you can block with an equal or stronger attack card, and the attack keeps stacking. If you cannot block, you draw the whole stack.
A joker can be played on any card, and any card can follow a joker.
7: change the suit to any suit you like.
J: skip the next player.
Q: reverse the direction of play.
K: play one more card.

When you are down to one card, press the One card! button. If you do not press it within 2.5 seconds, you draw 1 penalty card.
You can also press it in advance when you have two cards left. The AI calls it on its own.