Adding Doppelkopf a 48 cards combined half decks game. Played by 4. Teams 2 on 2 determined throughout the game. The game was influenced by Skat and Schafkopf and borrows from them. It is however very casual usually and the rule variations depend on the region you are in. Anyway to sum up trick an bid games are really fun!

Fyi for the US there is also binocle that has some traction and at least to my experience has been largely forgotten in the originating areas of Germany.