Bingo card cards to overcome the difficulty with randomization. There are two types of Bingo cards. One is a 5x5 grid meant for 75-ball Bingo, which is largely played in the U.S. The other uses a 9x3 grid for U.K. style "Housie" or 90-ball Bingo. Players use cards that feature five columns of five squares each, with every square containing a number (except the middle square, which is designated a "FREE" space). The columns are labeled "B" (numbers 1–15), "I" (numbers 16–30), "N" (numbers 31–45), "G" (numbers 46–60), and "O" (numbers 61–75). A popular Bingo myth claims that U.S. Bingo innovator Edwin
National Bingo Game of 6 tickets in the evening. In February 2014 the Prize structure of the National Bingo Game was revised and formally launched in March. Zone Prizes were removed and a program of ad-hoc prizes and promotions introduced, in addition to a progressive Jackpot Prize rising to £250,000. The special prizes and promotions vary throughout the year and include luxury cruises, additional cash and travel, while the Jackpot remains a constant prize available to be won on every National Bingo Game throughout the year, with the value of the prize varying dependent upon how many tickets have been sold and when