A lottery-like or bingo-like gambling game played at modern casinos is called keno. 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. Numbers from 1 to 80 are imprinted on each ball. The balls are mixed by a blower when it pushes air into the bubble. A "caller" is used to press 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.
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. 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.
Usually the house edge is from less than 4% to 66%.

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