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
Prize Bingo a claim and only then will the computer check it and end the game (or reject it if the player has made a mistake). As well as being announced verbally, most prize bingo establishments feature a TV monitor or several that shows the last called number and how many numbers have been called. In addition to this, the consoles often have a small LED display that shows this information when a game is in progress or the number of remaining credits when there is no game in progress. Prize bingo establishments also usually feature a 'floorwalker', whose job it is