Klammern is an Ace-Ten card game and variant of Jass, which is particularly widespread in the Alemannic region. It is played mainly in Switzerland, Liechtenstein, the Austrian state of Vorarlberg and in parts of southern Germany and Alsace. But the game is also finding more and more fans in the north-west of Germany, mainly in North Rhine-Westphalia. In Hamburg the game goes under the name Klapperjazz or Klapperjass and was initially played mainly by stevedores for "nen Heiermann", a 5 Mark piece. A die was used to keep score.