Cards are numbered 1-12, with black cards representing positive numbers and red negative. Cards played to the table in turn raise or lower the running value of the trick. A player bring the value to exactly 12 or 0 takes the trick and the points (positive and negative cards all score positive points). The running value of the trick may never go below 0 or above 12. If a player cannot play, he draws from the deck in Go Fish style. Play ends when one player empties their hand, and that player scores a bonus for doing so. - BoardGameGeek