The standard version of keno is played using a circular glass ball with numbered balls in it. The balls inside are numbered from 1 to 80. In a brick and mortar casino these balls are sucked into a tube to reveal the winning selection of numbers. At an online casino a number generator picks the various numbers and the draw process is then animated to simulate what happens in a regular casino.
When the game starts the players get a blank keno card which they then need to complete when you play keno game. The players can choose from 1 to 15 numbers in total. Thereafter 20 balls in total are drawn .
In some of the casinos these draws happen at specific times regardless of whether or not you want to to place a bet. At online casinos the machines would only draw the numbers once you have placed your bet. As a result the action will move along at the pace you want it to when you play online keno. So you never need to wait for those scheduled draws.
There are a few different pay-tables at different casinos and your pay out will be determined according to the number of matches you have with the balls drawn . You would be able to place different sizes of wagers at the start of every game and then your bet size gets worked out according to the payout tables.
It just depends on the casino you play at you might run into a number of very interesting pay-tables when you play casino keno and these can vary quite a lot . These different pay-tables then often have different house edges and different bonuses if you hit certain amounts of matches.