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. During the balldraw, a blower pushes air into the bubble and mixes the balls. 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.
An "X" is put 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.
Each casino sets its own series of pay scale choices called "paytables". Depending on how many numbers drawn match the numbers selected on the ticket the player is paid this or that sum of money. 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. One can hardly find two absolutely identical keno paytables.
Usually the house edge is from less than 4% to 66%.

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