Bruus, formerly Brausebart or Brusbart, is a north German card game for four players in two teams of two. It was once highly popular but has since died out except for a few pockets in the state of Schleswig-Holstein. As Brusbart, it was the ancestor of a family of similar games in northern Europe, including Swedish Bräus and Danish Brus which are still played today. Bruus features 'daring and tormenting' which has been said to give the game a certain charm. Once considered the national game of Hamburg, Bruus is a descendant of Karnöffel, the oldest identifiable European card game in the history of playing cards with a continuous tradition of play down to the present day. The game is named after the Bruus or Brusbart, once its top card, but now its second-highest trump.

A card game is any game that uses playing cards as the primary device with which the game is played, whether the cards are of a traditional design or specifically created for the game (proprietary). Countless card games exist, including families of related games. A small number of card games played with traditional decks have formally standardized rules with international tournaments being held, but most are folk games whose rules may vary by region, culture, location or from circle to circle.