Keno is often played in special Keno lounges in casinos. 
It is also now possible to play keno online, which works in much the same way as the casino version.
Keno tickets have numbers from 1 to 80. You can choose how many numbers to mark, although it is usually between 4 and 10. There are many different combinations of bets and payouts.
Straight Tickets is the basic kind of keno game. The number of spots you can mark will depend on the casino it will often be between 4 and 10.
Way Tickets is using one ticket to mark multiple sets of numbers. Mark the spots you want and group them together by ringing them.
Keno games run very frequently. You can usually bet on a number of consecutive games on the same ticket.
Numbers are drawn for each game at random from 1 to 80. There are usually 20 numbers drawn.
Many casinos also offer a video version of keno.