Bingo is a game of probability in which players mark off numbers on cards as the numbers are drawn randomly by a caller, the winner being the first person to mark off all their numbers. Bingo became increasingly popular across the UK with more purpose-built bingo halls opened every year until 2005. Since 2005, Bingo Halls have seen a marked decline in revenues and the closure of many halls. The number of bingo clubs in Britain has dropped from nearly 600 in 2005 to under 400 as of January, 2014. These closures are blamed on high taxes, the smoking ban, and the rise in online gambling, amongst other things.