In addition to a number from 1 to 104, each card has a point value. After finishing ten rounds, players tally their score and see whether the game ends. (Category 5 ends when a player has a score greater than 74, for example, while 6 nimmt! ends when someone tops 66.) When this happens, the player with the fewest points wins!
6 nimmt! works with 2-10 players, and the dynamics of gameplay change the more players that you have. One variant for the game has you use 34 cards, 44 cards, 54 cards, etc. (instead of all 104 cards) when you have three, four, five, etc. number of players. This change allows you to know which cards are in play, thereby allowing you to track which cards have been played and (theoretically) make better choices as to which card to play when.