A lottery-like or bingo-like gambling game played at modern casinos is called keno. There is a circular glass enclosure called a "bubble" containing 80 ping pong-like balls which determine the balldraw result in keno. Each ball has a number (from 1 to 80) imprinted on it. A blower pushes air into the bubble and mixes the balls during the balldraw. 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". The caller and a "verifier" record each of 20 balls drawn, and the computerized keno system calculates all wagers based on the numbers drawn.
Players wager by marking an "X" over the "spot" choices on a blank keno ticket form with 80 numbered selection boxes (1 to 80). 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. 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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