There are two card options for Bingo. You can play 6 cards for $35 or 3 cards for $20. This price gives you cards for 5 rounds of Bingo. You can also add an extra game card for the last game of the session (the Jackpot game) for an extra $15.
You get 5 sheets with either 3 or 6 Bingo cards printed on each. Each sheet is a different color and they use a specific color for each game.
A Jackpot round is played at the end of every session. Early in the cruise they call a certain amount of numbers and if nobody wins the Jackpot after that amount is called the Jackpot rolls over to the next session. They do continue after the requisite numbers are called and the winner(s) win a smaller amount of money.
I believe that on most cruises the Jackpot rolls over until the final day...it was that way on our cruise with the final Jackpot being over $5,000.