After the first- and second-place winners in DoubleDown Bingo have been announced, the game continues, and you're now playing for the Progressive Jackpot! The jackpot pays out when a player blacks out a card completely. The player or players who get closest before time runs out will receive a consolation prize at the end of each game.
Each card bought in DoubleDown Bingo adds to the jackpot. You can see the current total when you buy your cards at the start of the round.