Bidding box for home-played games. Use of bidding boxes has several advantages over oral bidding: it reduces noise in the room, prevents bidding being overheard at neighboring tables, allows easier review of the auction, and reduces the opportunity to pass unauthorized information to one's partner (intentionally or not) by the manner and intonation in which one makes one's bid. A bidding box is typically a plastic box with two slots, each containing a set of bidding cards. One slot contains 35 cards with symbols of bids (5 denominations—clubs (), diamonds (), hearts (), spades (), and notrump (NT)—in seven levels of bidding,
Doppelkopf highest ranking "Special" plays their game (the first player in bidding order winning in case of a draw). The possibilities, from lowest to highest, are: The Ten of Hearts (often called the "Dulle") is the highest trump in every normal game as well as any Suit Solo. Except for Hearts solo, there are actually more trumps than non-trump cards. One noteworthy result of this rule is that there are only six non-trump cards left in Hearts, making this suit more likely to be trumped in the first trick it is played. When a player has both Queens of Clubs or