Keno is an old game, dating back to 187-205 BC and was brought to America in the 19th century. Keno is likened to a lottery or bingo type gambling game and is played at all modern casinos. A live casino keno game uses a circular glass enclosure called a "bubble" containing 80 ping pong like balls which determine the balldraw result.
Each ball is imprinted with a number 1 through 80, during the balldraw a blower pushes air into the bubble and mixes the balls. A caller presses a level opening a tube, where the balls lift one at a time. The caller and a verifier record each of the 20 balls drawn and the computerized keno system calculates all wagers based on the numbers drawn.
Each casino sets its own series of pay scale choices called "paytables". The player is paid based on how many numbers drawn match the numbers selected on the ticket and according to the paytable selected with regard to the wager amount.
Each casino offers many different paytables and speciality keno bets for players to choose, each with it's own unique house edge. No two casino's keno paytables are identical.
Serious keno players use great imagination on keno tickets to make complex combinations of groups and ways with varying numbers of spots in each group. There is literally no limit to the way players can circle spots of like or a differing number of spots and in the resulting “ways” they can choose to play on a keno ticket.