Duction. Keno is a popular lottery game that is available with all of the larger casino softwares. The game is one of the worst bets in the casino, with a house edge that varies from 4% with Net Ent Jungle Keno to 30% with Boss Media Keno. Like state lotteries, the chance of winning as much as $100, 000 with a $1 bet can be appealing. Rules and Play.