Bingo is a game of chance where randomly-selected numbers are drawn and players match those numbers to those appearing on 5x5 matrixes which are printed or electronically represented and are known as "cards." The first person to have a card where the drawn numbers form a specified pattern is the winner and calls out "Bingo!" to alert others to the win. Bingo is a game used for legalized gambling in some countries.
Each bingo player is given a card marked with a grid containing a unique combination of numbers and, in some countries, blank spaces. The winning pattern to be formed on the card is announced. On each turn, a non-player known as the caller randomly selects a numbered ball from a container and announces the number to all the players. The ball is then set aside so that it cannot be chosen again. Each player searches his card for the called number, and if he finds it, marks it. The element of skill in the game is the ability to search one's card for the called number in the short time before the next number is called.
The caller continues to select and announce numbers until the first player forms the agreed pattern(one line, two lines, full house) on their card and shouts out the name of the pattern or bingo. One of the most common patterns, called house in the United Kingdom and Australia and full card, blackout and cover-all in Canada and the United States, simply consists of marking all the numbers on the card. Other common Canadian and American patterns are single line, two lines, centre cross, L, Y, inner square (4 × 4), roving square (3 × 3), and roving kite (a 3 × 3 diamond). On Canadian and American cards lines can be made horizontally, vertically, or diagonally. Inner and roving squares and kites must be completely filled; roving squares and kites may be made anywhere on the card.
