The players are trying to collect cards with marijuana themes, to became the biggest producer and dealer of these drugs.
Graskönig (Weed King) is a game by stoners for stoners. And since stoners have turned most of their brains into smoke, pretty much everything that makes up the game is stolen and not new. Players try to grow as much grass as possible to get the most points in a round. After four rounds the game is over.
Each player is dealt 15 cards and in turn you may draw a card and discard one. If a player thinks he has good cards, he knocks and all subsequent players are allowed to draw again. Now, all 3 cards must be laid out. You try to place light (energy), grass and a dealer here. The dealers have the values from 1 to 5, the light 25, 50 or 100%, and grass 10, 20, 50, 150 or 200. All of the cards played are added up for your total points for that play.
In turn, players now play attack cards on either the light, grass, or the dealer with other players who can defend themselves if they have the right card. If a player has to remove a card, he must play a substitute immediately or he gets nothing from the round. What's different is that at this point you can't play any more grasses, only when everyone has passed. Then points are calculated. For example: 300 grams of weed x 3 dealer's stars x 50% = 450 points. There are some cards that can improve the result or detract from it: the raid doubles all points, the hemp allergy halves them. Whoever has the most accumulated points after 4 rounds is considered the Graskönig and wins the game.