 The show was one of the first UK game shows which allowed viewers to take part at home and win.The show was sponsored by "The Sun" newspaper, and each week the viewer was supplied with a game-card (to viewers that purchased a copy of the newspaper).They had to cross off numbers that appeared on that week's show and those that crossed off all their numbers by the time the 'big hooter' sounded on the show would win (or share if there was more than one winner) a prize of £20,000.