Each player starts by putting, in order, one layer each in the card box. When all cards are put in the box an upper layer finishes the process. The card box is then rotated a couple of times until none of the players are sure which cards lay where.
Then each player tries, with help of the "spade", to "dig out" as many cards with plus points as possible. Those plus points are worth money.
As soon as you stumble upon a minus card, you have to give the spade to the next player, lose all the money you collected so far this turn AND pay the minus penalty. You may also stop anytime before.
The player who has collected the most money when the game ends, is the winner.