A lot of modern casinos offer an opportunity to play keno - a lottery-like or bingo-like gambling game. 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. Each ball is imprinted with a number 1 through 80. 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" are used to record each of 20 balls drawn, and the computerized keno system is used to calculate 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". 20 balls at random are drawn only after the players wagers are placed.
Every casino has its "paytables" - series of pay scale choices. 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. One can hardly find two absolutely identical keno paytables.
Usually the house edge is from less than 4% to 66%.

 

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