A lottery-like or bingo-like gambling game played at modern casinos is called keno. 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. There are numbers from 1 to 80 on each keno ball. A blower is used to push air into the bubble and mix the balls during the balldraw. 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". 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.
The series of pay scale choices called "paytables" are set by each casino. 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. There is a wide range of keno paytables from casino to casino and a large deviation in the house edge set for each of those paytables. No two casinos' keno paytables are identical.
The house edge can vary from less than 4% to 66%.

 

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