Keno is played at modern casinos, it is a lottery-like or bingo-like gambling game. 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" 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.
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 all players successfully place their wagers, 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. Keno paytables and the house edge set for each of those paytables vary greatly from casino to casino. There are no identical two casinos' keno paytables.
The house edge can vary from less than 4% to 66%.

 

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