You and a computer partner against two computer players.
Four players in two teams; partners sit opposite. Play goes to the right (anticlockwise). Aces are high.
The dealer gives everyone five cards. The player on the dealer's right is the caller: they choose trumps (the rung) from those five cards. Then everyone gets eight more cards, four at a time.
The caller leads first. You must follow the led suit if you can; otherwise play anything. The highest trump wins, or else the highest card of the led suit. The winner leads next.
Tricks pile up in the middle. A player takes the whole pile only by winning two tricks in a row. The 13th trick takes whatever is left. A court needs all thirteen tricks.
The caller places a trump card face down. A player who can't follow suit may ask to see it, and then must trump if they can. Cards played before the reveal never count as trumps.
Click a card to pick it, then click it again to play it. On a phone, slide your finger along your hand to pick a card, then tap it again (or flick it up).
A private table for you and up to three friends or family. Each person plays on their own phone or computer.