UNO DOUBLED is a card game that is similar to the classic game of UNO. It is played with two decks of UNO cards and the goal is to be the first player to get rid of all their cards. The game is played with two teams of two players each, and the team that gets rid of all their cards first wins. The term DOS, which is the answer to the crossword puzzle, is Spanish for two, which is the number of decks used in the game.