Keno is played at modern casinos, it is a lottery-like or bingo-like gambling game. A circular glass enclosure called a "bubble" containing 80 ping pong-like balls which determine the balldraw result is used in the game of keno. 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 lever opening a tube, where the balls lift one at a time into a "V" shaped tube called the "rabbit ears". Each of 20 balls drawn are recorded by the caller and a "verifier" and all wagers based on the numbers drawn are calculated by the computerized keno system.
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.
"Paytables" are series of pay scale choices that are set by the casino. The more numbers drawn match the numbers selected on the ticket the more the player is paid. Keno paytables and the house edge set for each of those paytables vary greatly from casino to casino. Two identical keno paytables can hardly be found.
The house edge can vary from less than 4% to 66%.

 

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