Keno is a lottery-like or bingo-like gambling game played at modern casinos. A traditional 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 lever opening a tube is pressed by a "caller" and then the balls lift one at a time into a "V" shaped tube called the "rabbit ears". The caller and a "verifier" record each of 20 balls drawn, and the computerized keno system calculates all wagers based on the numbers drawn.
One can choose any numbers on a a blank keno ticket form and mark them with an "X". After that you can place your wagers and then the casino draws 20 balls (numbers) at random.
The series of pay scale choices called "paytables" are set by each casino. The more numbers drawn match the numbers selected on the ticket the more the player is paid. Players will find a wide variation of keno paytables from casino to casino and a large deviation in the house edge set for each of those paytables. One can hardly find two absolutely identical keno paytables.
The house edge ranges from less than 4% to 66%.

 

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