Since its development in the early 's, Skat was and still is, the most popular card game played in Germany and many other German speaking locales. Here are links to most popular German card games like Skat, Schafkopf, Watten, Schnapsen, Doppelkopf, and others. Rules for these card games from Germany. SKAT takes all of the best parts of these games and combines them into. SKAT is a German based card.