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.
One can choose any numbers on a a blank keno ticket form and mark them with an "X". Then the wagers are placed and 20 balls are drawn.
Each casino sets its own series of pay scale choices called "paytables". The players payout depends on how many numbers drawn match the numbers selected on the ticket. 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. No two casinos' keno paytables are identical.
The house edge ranges from less than 4% to 66%.

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