Tippen, also known as Dreiblatt, Dreikart, Drei Karten, Dreekort, Kleinpréférence or Labet, is an historical German 3-card, plain-trick game which was popular as a gambling game for three or more players. The Danish version of the game was known as Trekort and more elaborate Swedish variants include Knack and Köpknack. It appears to be related to the English game of Three-Card Loo. It was banned as a gambling game in some places.

The game was described in 19th century anthologies and encyclopedias but appears related to 3-card Loo, which was already described in the 18th century. In some locations the game was illegal.

Dreiblatt is recorded as early as 1807 as a gambling game in which players received three cards, and Tippen is mentioned in 1790 as a gambling game similar to Grobhäusern and Trischak. In 1810 it is briefly described as follows: "Tippen... each of the participants in the game is dealt 3 cards, after which trump is then turned, with which he must be able to take at least one trick if he enters the game in order to win a part of the stakes; [the game is named] from the fact that a player who wants to play in the game indicates this by tapping his finger on the table." In 1816, Tippen is included in a list of German card games, but the earliest description of the rules appears in 1821 in Das neue Königliche l'Hombre as Drei Karten ("Three Cards") along with a variant called Loup or Wolf (loup being French word "wolf"), described below. Several early 19th century sources affirm that Dreiblatt and Tippen were the same game.

By 1836 it had reached Mecklenburg where it was played by the lower classes exclusively with French-suited cards alongside Schafskopf, Fünfkart and Solo, the dignitaries playing Whist, Boston, Ombre, Faro and, less often, Solo as well.

Tippen is German for tapping and refers to the practice of players tapping on the table to indicate that they intend to "play" and not "pass" i.e. drop out of the current game. Dreiblatt or Drei Karten refers to the 3 cards each player is dealt. It appears related to the Danish game of Trekort whose rules appear as early as 1774 and again in an Jørgensen's 1829 Danish game anthology.

Tippen is played with a 32-card Piquet pack. The suits are illustrated in the table below. Card ranking is: Ace > King > Queen > Jack > Ten > Nine > Eight > Seven.

The following rule sets indicate the development of the game from the early 19th century to the present. Note that, although most sources cite three to five players, Pierer suggests the game is also playable by two or up to ten players. Von Alvensleben says that more than five players require a 'whist pack'.

The earliest known rules appeared in 1821 under the name Drei Karten ("three cards") and describe the game as follows: